2) COMP1, COMP2, COMP3 and COMP4 are different types of general register computers using 3, 2, 1 and 0 address instruction formats respectively. Consider the sequence of the arithmetic equations below. a) Write a program to evaluate these equations (all 3 of them sequentially together) for each computer . Use minimum number of instructions. X= A +(B - (C*D)) Y= A - (B+(C*D)) Z=Y-X b) Convert the arithmetic expression , (5+7)[12(3+9)+7], into reverse Polish Notation and show the stack operations in a table to get the numerical result