The correct answer is Pinning promotes the issue to the top of the repository's issues list so it is more visible.

When a maintainer pins an issue, GitHub displays it in a pinned section at the top of the Issues tab, which makes it stand out to contributors who are scanning the list. Pinning does not alter the issue's state or status, and it only elevates visibility within the repository.

Pinning is required before an issue can be closed is incorrect because closing an issue is independent of pinning and anyone with the required permissions can close an issue whether it is pinned or not.

Pinning converts the issue into a completed item that is removed from the open list is incorrect because pinning does not change whether an issue is open or closed and it does not remove the issue from lists.

Pinning moves the issue into GitHub Projects for planning is incorrect because Projects is a separate planning tool and issues are added to a project explicitly while pinning only affects placement within the Issues view.

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