What does this function do$?$

int mystery$($double employees$[],$ double id$,$ int size$)\{$ for $($int i $=0$; i $<$ size; i$++)\{$ if $($id $==$ employees$[$i$])\{$ return i; $\}\}$ return $-1$; $\}$

Group of answer choices

This is a function that performs a search. If the id is found in the employees array, its index location is returned, otherwise $-1$ is returned.

This is a function that returns all index numbers in the employees array, one at a time. Once the entire array has been processed, $-1$ is returned.

This is a function that swaps the value in the id variable with the value in the employees array at index i$.$ If the swap cannot be performed, $-1$ is returned.

This is a function that sorts the employees array