Which of the following is a valid function header $($that is$,$ part of the code that defines the function$)$ for the getFee$()$ function, which receives an integer first and a number with a decimal place second? The Function returns a number with a decimal place.

double getFee$($ int base, double rate $)$

getFee$($ int base, double rate $)$;

double getFee$($ double base, int rate$)$

double getFee$($ int base, double rate $)$;