I want to write a function decrement to decrease the value of an integer by one in a function, but don't want to use a reference parameter, instead I pass a pointer to the value I want to change and call it p;

void decrement$($int $*$p$)\{$

$//$ What would go here?

$\}$

What would I put where is says "What would go here?" to complete this function?

Group of answer choices

none of these

&p $=*$p $-1$;

p $=$ p $-1$;

&p $=$ &p $-1$;

&p $=$ p $-1$;