Read the sentence.The college cafeteria, which is free for all full-time faculty, is a popular and safe environment for students to study.

The clause “which is free for all full-time faculty” adds extra information about the cafeteria but is not needed to identify the sentence’s main point. It is a nonessential clause, so it is set off with commas. The correct choice is “which is free for all full-time faculty.”

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