The following sentence has a misplaced modifier.

Tired of studying and writing research papers, summer vacation came as a relief to the student.

Which revision corrects the error in the sentence?

Summer vacation came as a relief to studying and writing research papers for the student.
Relief to the student came as summer vacation, which was tired of studying and writing research papers.
Summer vacation came as a relief to the student, who was tired of studying and writing research papers.
The student, who was tired of studying and writing research papers, came to summer vacation as a relief.