What function do track selectors serve in Avid Media Composer?

Track selectors in Avid Media Composer play a critical role in identifying and selecting specific tracks in a source clip. They allow editors to specify which audio or video tracks from the source material they want to utilize during the editing process. This feature enhances the control an editor has over their workspace by enabling them to selectively work with input from certain tracks, making it easier to manage complex projects that may involve multiple video and audio tracks.

The functionality of track selectors is pivotal during the editing process, as it assists in organizing clips according to an editor's needs and preferences. They are especially useful when dealing with multiple layers of video or audio, allowing an editor to isolate tracks for tasks such as enabling or disabling specific components or for routing audio in a particular way. This is why the correct answer highlights their primary purpose as crucial for effective editing in Avid Media Composer.