I'm having trouble translating the problem's possible choices to English. What is the answer?

Let F(x, y) be the predicate that indicates if x and y are friends, with the domain of people. Which of the following statements in predicate logic expresses the statement that

"Every person has a single friend"?

Possible Choices

x y z [ (F(x, y) (y z) ) F(x, z) ]

x y [ F(x,y) z F(x, z) ]

x y z [ (F(x, y) (y z) ) F(x, z) ]