If the Function Is One-To-One, Find Its Inverse $$f ( x ) = \sqrt { x - 3 } , x \geq 3$$

Multiple Choice

If the function is one-to-one, find its inverse. If not, write ʺnot one-to-one.ʺ
- $$f ( x ) = \sqrt { x - 3 } , x \geq 3$$

A) $f ^ { - 1 } ( x ) = \sqrt { x + 3 }$
B) $f ^ { - 1 } ( x ) = x ^ { 2 } + 3 , x \geq 0$
C) not a one-to-one
D) $f ^ { - 1 } ( x ) = ( x - 3 ) ^ { 2 }$