Which of the following is correct expression for the C code:

d $=$ e $-$ f

where d$,$ e and f are in $s$1,$ $s$2$ and $s$3,$ respectively

Group of answer choices

subi $s$2,$ $s$3,$ $s$1$

subi $s$1,$ $s$2,$ $s$3$

sub $s$2,$ $s$3,$ $s$1$

sub $s$1,$ $s$2,$ $s$3$