Determine Whether the Given Function Is One-To-One $$f ( x ) = \frac { 2 } { x }$$

Multiple Choice

Determine whether the given function is one-to-one. If it is one-to-one, find its inverse function.
- $$f ( x ) = \frac { 2 } { x }$$

A) $f ^ { - 1 } ( x ) = \frac { x } { 2 }$
B) $\mathrm { f } ^ { - 1 } ( \mathrm { x } ) = \frac { 2 } { \mathrm { x } }$
C) $\mathrm { f } ^ { - 1 } ( \mathrm { x } ) = - 2 \mathrm { x }$
D) not a one-to-one function