what does the following function $($myfunc$)$ do $?$

myfunc

LDR R$1,=$Num ;

LDR R$0,[$R$1]$ ;

CMP R$0,$#$0$

BGE return

RSB R$0,0$;

STR R$0,[$R$1]$

return

BX LR

Group of answer choices

myfunc sets the variable num to zero.

myfunc increments the variable num.

myfunc stores the absolute value of the variable num. to itself

myfunc returns zero if the variable num is less than $0.$