Internal documentation involves

Question

BlackTom AI · Accepted Answer

Internal documentation is the practice of placing explanatory material directly inside the source code so future readers (developers, maintainers) can understand intent, structure, and usage.

1) Relevant knowledge points and concepts
- Internal documentation = comments, inline notes, docstrings, function headers and annotations that live inside the codebase.
- Purpose: clarify algorithms, explain non-obvious decisions, describe function parameters/return values, mark TODOs and edge cases.
- Distinct from testing/validation or high-level planning documents (external documentation), which serve other roles like user guides, specifications, or test reports.

2) Step‑by‑step reasoning process
- Read option a: "checking that the output is as expected." That is verification/testing (unit tests, QA), not documentation. So a is incorrect.
- Read option b: "checking that input is reasonable." That describes input validation or error handling in code; again this is runtime validation, not documentation. So b is incorrect.
- Read option c: "planning the steps of processing of an application." That is design or planning (flowcharts, pseudocode, specifications). Planning could lead to documentation but is not the in‑code explanatory material referred to by internal documentation. So c is incorrect.
- Read option d: "adding comments to an application to explain the code." This exactly matches the definition of internal documentation — comments and docstrings embedded in the source to explain code behavior, parameters, return values, and rationale.

3) Intermediate considerations (examples)
- Examples of internal documentation: // comment lines in C/C++, """docstrings""" in Python, Javadoc comments above methods. These live with the code and are read by developers.
- External documentation examples (not internal): user manuals, API reference pages generated from docs, design specs, and test cases.

4) Why the correct answer is correct
- Option d precisely names the action (adding comments) and purpose (to explain code), which is the core activity known as internal documentation.

5) Why the other options are incorrect (brief)
- a: describes testing/verification.
- b: describes validation/error checking in runtime.
- c: describes planning/design phase, not in‑code explanatory comments.

Conclusion: The correct choice is d. adding comments to an application to explain the code. This matches the provided answer.

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