This MS-900 practice question tests your understanding of describe cloud 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.
A startup wants to focus only on developing and deploying its application code without managing underlying servers or operating systems. Which cloud service model best fits this need?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Why wrong: IaaS provides virtualized hardware resources like VMs and storage, but the user must manage the operating system and middleware, so it doesn't fully eliminate server management.
B
Platform as a Service (PaaS)
PaaS provides a complete platform including OS, runtime, and tools, so the startup can deploy and manage applications without server-level maintenance.
C
Software as a Service (SaaS)
Why wrong: SaaS delivers fully functional applications to end users, not a development platform for custom code.
D
On-premises deployment
Why wrong: On-premises requires the company to own and manage all hardware and software, which is the opposite of the desired approach.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Platform as a Service (PaaS)
Platform as a Service (PaaS) is the correct choice because it abstracts the underlying infrastructure, including servers, operating systems, and runtime environments, allowing the startup to focus solely on developing and deploying application code. With PaaS, the cloud provider manages the OS patching, hardware scaling, and middleware, while the customer only manages the application and data. This directly matches the requirement of not managing servers or operating systems.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Infrastructure as a Service (IaaS)
Why it's wrong here
IaaS provides virtualized hardware resources like VMs and storage, but the user must manage the operating system and middleware, so it doesn't fully eliminate server management.
✓
Platform as a Service (PaaS)
Why this is correct
PaaS provides a complete platform including OS, runtime, and tools, so the startup can deploy and manage applications without server-level maintenance.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Software as a Service (SaaS)
Why it's wrong here
SaaS delivers fully functional applications to end users, not a development platform for custom code.
✗
On-premises deployment
Why it's wrong here
On-premises requires the company to own and manage all hardware and software, which is the opposite of the desired approach.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse PaaS with IaaS, mistakenly thinking that IaaS also abstracts the OS, but IaaS only abstracts the hardware while leaving OS management to the customer.
Detailed technical explanation
How to think about this question
Under the hood, PaaS platforms like Azure App Service or AWS Elastic Beanstalk automatically handle OS updates, load balancing, and scaling via orchestration layers (e.g., Kubernetes or Service Fabric). A subtle behavior is that while PaaS abstracts the OS, the customer may still need to choose a runtime stack (e.g., .NET, Node.js) and configure environment variables, and the provider enforces a specific sandbox—meaning certain low-level system calls (e.g., direct kernel access) are blocked. In a real-world scenario, a startup using Azure App Service can deploy a web app via Git or CI/CD without ever SSH-ing into a VM, but if they later need custom OS-level drivers, they would have to migrate to IaaS.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MS-900 question in full detail.
Describe cloud concepts — This question tests Describe cloud concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Platform as a Service (PaaS) — Platform as a Service (PaaS) is the correct choice because it abstracts the underlying infrastructure, including servers, operating systems, and runtime environments, allowing the startup to focus solely on developing and deploying application code. With PaaS, the cloud provider manages the OS patching, hardware scaling, and middleware, while the customer only manages the application and data. This directly matches the requirement of not managing servers or operating systems.
What should I do if I get this MS-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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