The CODEOWNERS file in a GitHub repository is used to define individuals or teams that are responsible for specific parts of the codebase. When changes are made to files or directories that match the patterns specified in the CODEOWNERS file, GitHub automatically requests reviews from the listed code owners.
Setting Reviewers Automatically:
Option D is correct because the primary purpose of a CODEOWNERS file is to automatically set reviewers for pull requests that affect the specified files or directories. This ensures that the appropriate team members are notified and review the changes before they are merged.
Incorrect Options:
Option A is incorrect because the CODEOWNERS file does not restrict who can edit specific files; it only influences who is required to review changes.
Option B is partially related but not fully accurate because while CODEOWNERS does require certain reviews, it does not mandate peer review for all code changes.
Option C is incorrect because the CODEOWNERS file does not define access permissions for the repository; it deals with code review processes.
Reference:
GitHub Docs: About CODEOWNERS
GitHub Blog: Automatically Requesting Reviews with CODEOWNERS

As a GitHub user, you can configure two-factor authentication (2FA) to secure your account by navigating to Settings -> Password and Authentication -> 2FA. This section in the GitHub user interface allows you to set up and manage your 2FA methods, which provide an additional layer of security beyond just your password.

The feature you can use to merge proposed changes in a repository on GitHub is Pull requests. Pull requests are a core feature of GitHub, allowing developers to propose changes to a codebase, review code, discuss the changes, and eventually merge them into the main branch. This collaborative workflow ensures that code is reviewed and vetted before becoming part of the project.

GitHub Teams, as part of GitHub's paid plans, offers additional features and capabilities compared to GitHub Free, particularly for organizations.
GitHub Teams Benefits:
Option B is correct because GitHub Teams provides advanced security features like SAML single sign-on for secure authentication, as well as increased minutes for running GitHub Actions, which are essential for continuous integration and deployment workflows.
Incorrect Options:
Option A is incorrect because private repositories and advanced tools are features available, but the key differentiator in this context is the SAML SSO and additional GitHub Actions minutes.
Option C is incorrect because while expanded storage and priority support are valuable, SAML SSO and increased GitHub Actions minutes are more central to the differences between GitHub Free and GitHub Teams.
Option D is partially correct, but since the question asks for the best reason, Option B provides the most critical features that differentiate GitHub Teams from GitHub Free.
Reference:
GitHub Docs: About GitHub Teams

GitHub supports various syntax formats that align with Markdown and HTML conventions. Here's a breakdown of the provided options:
Comment Syntax:
Option C is correct. The syntax <!-- This is a comment --> is used in Markdown files to insert comments. These comments will not be rendered in the final output, making them useful for adding notes or instructions within the code or documentation.
Incorrect Options:
Option A (* This is a heading) is incorrect because an asterisk (*) denotes an unordered list item, not a heading. A heading in Markdown is typically created with one or more hash symbols (#).
Option B (This is a link) is incorrect because this is plain text and not the syntax for creating a link. The correct syntax would be [This is a link](URL).
Option D (This is bolded text) is incorrect because this is plain text, not the correct Markdown syntax for bold text, which should be **This is bolded text** or __This is bolded text__.
Option E (1. This is an ordered list) is incorrect as it does represent an ordered list item, but it was not the syntax format asked about in the question. The question specifically focuses on matching associated text with syntax, where only the comment option is correct.
Reference:
GitHub Flavored Markdown (GFM)
GitHub Docs: Basic writing and formatting syntax