Use the following MIPS diagram for the first three questions.

QUESTION $1$

Which code would fail if the line marked as $2$ is cut?

add $$s1,$$$t0,$$$t1$

add $$s2,$$$t2,$$$s1$

add $$s3,$$$t3,$$$s2$

add $$s1,$$$t0,$$$t1$

add $$s2,$$$t2,$$$t3$

add $s $3,$$$s2,$$$s1$

add $$s1,$$$t0,$$$t1$

add $$s2,$$$t2,$$$t3$

add $$s3,$$$s1,$$$s2$

add $s $1,$$$t0,$$$t1$

add $$s2,$$$s1,$$$t2$

add $$s3,$$$s2,$$$t3$