For the following MIPS instructions, indicate source registers and destination registers. $($source register: read during the instruction's execution. destination register: written during the instruction's execution.$)(1$ point$)$

add $$t3,$$$t2,$ $zero

sub $$t3,$$$t1,$$$t4$

addi $$t1,$$$t2,100$

Iw $$s1,4($$gp$)$

sw $s$1,12($$gp$)$

bne $$t1,$$$s2,$ loop$1$