lw $t$0,0($$a$0)$

add $t$1,$ $t$0,$ $t$2$

sub $t$3,$ $t$1,$ $t$4$

sw $t$3,4($$a$1)$

a$-$ Identify any structural hazards in the code above. Explain how they may occur.

b$-$ Identify any data hazards in the code above. Explain which instructions cause data hazards and the type of data hazard present.