If Both $f$ And $g$ Are One-To-One Functions, And $( f \circ g ) ( x ) = x ^ { 3 }$

Multiple Choice

If both $f$ and $g$ are one-to-one functions, and $( f \circ g ) ( x ) = x ^ { 3 }$ , then which of the following is/are true?

A) $( g \circ f ) ( x ) = x ^ { - 3 }$
B) $g$ is the inverse function of $f$
C) $f$ is the inverse function of $g$
D) None of the above is true.