Which word in the sentence is the appositive? My friend Justin was responsible for the birthday party Which word in the sentence is the appositive?

Appositive is noun or noun phrase in
which retitles, renames and helps describe the noun that is adjacent to it in
the sentence. The appositive is like a more clear illustration or wants to
illuminate the said subject in the statement. 1.          The appositive word in the sentence is,
”my friend” in my friend, Justin was responsible for the
birthday party. Which describes and renames Gary Jackson in the
sentence