$(6$ points, $3$ each$)$ Provide the assembly language code for the following:

a$.$ Assume that we have a machine that uses a stack based ISA, including the

instructions PUSH, POP, MULT, ADD, SUB, and DIV. Write the code for the

expression $Q=x+$y$/($z $-$ b$)+$ d

b$.$ Assume that we have a three address ISA, with the registers R$1,$ R$2,$ R$3,$ R$4,$

etc. How would you write this same expression? The code should be written

using standard precedence, left$/$right processing order, and without re$-$using

any temporary registers during the calculation. In other words, the first

intermediate result should be assigned to $R1,$ the next intermediate result to

$R2,$ etc. The final result should be stored in $Q.$