Quick Answer
The answer is inheritance, encapsulation, and polymorphism. These three are the foundational characteristics of object-oriented programming because they define how data and behavior are structured and reused. Inheritance allows a class to derive properties and methods from a parent class, encapsulation bundles data with the methods that operate on it while hiding internal state, and polymorphism enables objects of different classes to be treated through a common interface, with method calls resolved at runtime based on the actual object type. On the CompTIA ITF+ FC0-U61 exam, this question tests your ability to distinguish core OOP pillars from related but non-defining concepts like abstraction or modularity; a common trap is selecting “abstraction” instead of “polymorphism” because both involve hiding complexity, but only polymorphism directly concerns runtime behavior across classes. A helpful memory tip is to think of the acronym PIE: Polymorphism, Inheritance, and Encapsulation.
This FC0-U61 practice question tests your understanding of software development concepts. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which THREE of the following are characteristics of object-oriented programming (OOP)? (Select THREE).
Polymorphism
Polymorphism allows objects to be treated as instances of their parent class.
Encapsulation
Encapsulation bundles data and methods within objects.
Inheritance
Inheritance allows classes to derive from other classes.
Top-down design
Why wrong: Top-down design is a structured programming approach, not an OOP characteristic.
Sequential execution
Why wrong: Sequential execution is not exclusive to OOP; it applies to most programs.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Polymorphism
Polymorphism is a core OOP concept that allows objects of different classes to be treated as objects of a common superclass, with method calls resolved at runtime based on the actual object type. This enables one interface to be used for a general class of actions, with specific behavior determined by the specific object instance.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Polymorphism
Why this is correct
Polymorphism allows objects to be treated as instances of their parent class.
Related concept
Read the scenario before looking for a memorised answer.
Encapsulation
Why this is correct
Encapsulation bundles data and methods within objects.
Related concept
Read the scenario before looking for a memorised answer.
Inheritance
Why this is correct
Inheritance allows classes to derive from other classes.
Related concept
Read the scenario before looking for a memorised answer.
Top-down design
Why it's wrong here
Top-down design is a structured programming approach, not an OOP characteristic.
Sequential execution
Why it's wrong here
Sequential execution is not exclusive to OOP; it applies to most programs.
Common exam traps
CompTIA often tests the distinction between OOP principles (encapsulation, inheritance, polymorphism) and procedural or structured programming concepts (top-down design, sequential execution), so candidates mistakenly select familiar-sounding terms like 'top-down design' without recognizing they belong to a different paradigm.
Detailed technical explanation
Polymorphism in OOP is typically implemented via virtual method tables (vtables) in languages like C++ or dynamic dispatch in Java and C#; the actual method invoked is determined at runtime by the object's class, enabling code like `Animal a = new Dog(); a.sound();` to call `Dog.sound()` even though the reference type is `Animal`. This allows for extensible frameworks where new subclasses can be added without modifying existing code that uses the base class interface.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the FC0-U61 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Software Development Concepts — This question tests Software Development Concepts — Read the scenario before looking for a memorised answer..
The correct answer is: Polymorphism — Polymorphism is a core OOP concept that allows objects of different classes to be treated as objects of a common superclass, with method calls resolved at runtime based on the actual object type. This enables one interface to be used for a general class of actions, with specific behavior determined by the specific object instance.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which TWO are characteristics of object-oriented programming? (Choose two.)
mediumWhy A: The correct answers are B and C: Inheritance and encapsulation. Inheritance allows classes to derive from others; encapsulation bundles data and methods. Loops (A) are not OOP-specific. Functions (D) are procedural. Variables (E) are generic.
Variation 2. Which TWO of the following are common characteristics of object-oriented programming languages?
mediumWhy D: Inheritance is a core characteristic of object-oriented programming (OOP) that allows a class to derive properties and behaviors from a parent class, promoting code reuse and hierarchical relationships. This is a defining feature of OOP languages like Java, C++, and Python, distinguishing them from procedural or functional paradigms.
Variation 3. Which TWO of the following are characteristics of object-oriented programming (OOP)?
hardWhy C: Options A and C are correct: inheritance allows classes to derive from others, and encapsulation hides internal state. Option B is wrong because recursion is not OOP-specific; Option D (global functions) is procedural; Option E (top-down design) is structured programming.
Variation 4. Which TWO of the following are characteristics of object-oriented programming (OOP)?
mediumWhy B: Encapsulation and inheritance are core OOP concepts. Procedural programming uses functions, not objects. Top-down design is associated with procedural programming. Polymorphism is also an OOP concept, but the question asks for two; we have encapsulation and inheritance.
Last reviewed: Jun 30, 2026
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