Choose the sentence that is written correctly.

A) My friend Tran Nguyen is going, on a summer vacation, with my family.
B) My friend Tran Nguyen is going on a summer vacation, with my family.
C) My friend, Tran Nguyen, is going on a summer vacation with my family.
D) My friend, Tran Nguyen, is going on a summer vacation, with my family.