do the following problems SHOW ALL WORK$1.$ Show how operations on the stack are formed, show ALL stack various stages computing the value of the postfix expression:a$.123+*321-+*$b$.852+-381++*2+2+3.$ Use the infix to postfix conversion algorithm to transform the infix expression to postfix form $($use stacks$)$:A $*$ B $+$ C $*$ D EA $+$ B $*$ C D $*$ EG $*($ B $+$ C $)($ D $+$ ETransform the postfix expression to infix form. Show ALL the steps.a$.$ A B $*$ C D E $/-+$A B $-$ C $+$ D E F $-+*$