The answer is DBCA. This output is determined by Python’s method resolution order (MRO) for multiple inheritance, which uses the C3 linearization algorithm to create a consistent, monotonic lookup path. In the given class hierarchy, class D inherits from B and C, which both inherit from A; C3 linearization resolves the order as D, B, C, A, so each super() call follows this chain, printing D, then B, then C, then A as a concatenated string. On the Certified Associate Python Programmer PCAP exam, this tests your understanding of how Python resolves method calls in diamond-shaped inheritance, a common trap where candidates mistakenly assume depth-first or left-to-right order without considering the linearization rules. A reliable memory tip is to remember that C3 linearization ensures a child class always appears before its parents, and that the last class in the MRO is always the ultimate base class (object or the topmost superclass).
PCAP Object-Oriented Programming Practice Question
This PCAP practice question tests your understanding of object-oriented programming. 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.
Exhibit
class A:
def method(self):
print("A", end="")
class B(A):
def method(self):
print("B", end="")
super().method()
class C(A):
def method(self):
print("C", end="")
super().method()
class D(B, C):
def method(self):
print("D", end="")
super().method()
obj = D()
obj.method()
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
DBCA
The MRO for class D using C3 linearization is D -> B -> C -> A. Therefore, D calls super() to B, B calls super() to C, C calls super() to A. Output: D B C A (as a concatenated string).
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
DBACA
Why it's wrong here
This would imply repeated calls, which is not the case.
✗
DCBA
Why it's wrong here
This would imply C before B, which is not the MRO.
✓
DBCA
Why this is correct
Correct sequence: D, then B, then C, then A.
Related concept
Static NAT maps one inside address to one outside address.
✗
DBAC
Why it's wrong here
This would imply B then A then C, which does not follow the MRO.
✗
Error
Why it's wrong here
The code runs without error and produces output.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Trap categories for this question
Command / output trap
The code runs without error and produces output.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCAP NAT questions on configuration and troubleshooting.
Object-Oriented Programming — This question tests Object-Oriented Programming — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: DBCA — The MRO for class D using C3 linearization is D -> B -> C -> A. Therefore, D calls super() to B, B calls super() to C, C calls super() to A. Output: D B C A (as a concatenated string).
What should I do if I get this PCAP question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCAP NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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This PCAP practice question is part of Courseiva's free Python Institute certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCAP exam.
Question Discussion
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