Determine Whether the Function Has an Inverse Function $f ^ { - 1 } ( x ) = - \frac { 1 } { 2 }$

Multiple Choice

Determine whether the function has an inverse function.If it does,find the inverse function. ?
F(x) = -2
?

A) f^-1(x) = 2
B) $f ^ { - 1 } ( x ) = - \frac { 1 } { 2 }$
C) $f ^ { - 1 } ( x ) = \frac { 1 } { 2 }$
D) f^-1(x) = -2
E) No inverse