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Read the text and answer the question below.

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--text--

After his conversation with Sophie, Mark decided to write to his mentor David to reflect on what he had learned.

Hi David,

I just wanted to share a quick update. After sitting in on a recent code review, I finally feel like I'm starting to understand some key programming concepts.

Sophie explained terms like polymorphism, encapsulation, inheritance, and abstraction. For example, I saw how encapsulation helps with keeping details hidden and making the code easier to work with. I also noticed polymorphism in a method that changes behavior depending on the input.

I tried writing a small class using these ideas — focusing on clean code structure, reusing properties and methods, and simplifying functionality.

Does it mean I'm on the right track if I can explain these terms and apply them in a simple project?

Thanks for explaining these things over time. I appreciate the explanations and all your support.

Best,

Mark

What helped Mark begin to understand programming concepts more clearly?

--answers--

Writing unit tests for a legacy system.

--feedback--

There's no mention of testing or legacy systems in the email.

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Joining a code review and talking with Sophie.

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Debugging a major error on his own.

--feedback--

Mark learned from reviewing and discussing code — not from debugging by himself.

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Rewriting the entire codebase from scratch.

--feedback--

The email doesn't mention rewriting code.

--video-solution--

2

--explanation--

Mark mentions sitting in on a code review and learning from Sophie.

This experience helped him better understand programming terms, which makes it the most relevant detail.