The Function F Is One-To-One $$f ( x ) = \sqrt { x - 1 }$$

Multiple Choice

The function f is one-to-one. Find its inverse.
- $$f ( x ) = \sqrt { x - 1 }$$

A) $f ^ { - 1 } ( x ) = x ^ { 2 } - 1 , x \geq 0$
B) $f ^ { - 1 } ( x ) = \sqrt { x + 1 }$
C) $f ^ { - 1 } ( x ) = x ^ { 2 } + 1 , x \geq 0$
D) $f ^ { - 1 } ( x ) = ( x - 1 ) ^ { 2 }$