The expression (a * b) * c op…. where ‘op’ is one of ‘+’, ‘*’ and ‘­ \(\uparrow\) ’ (exponentiation) can be evaluated on a CPU with a single register without storing the value of (a * b) if

(a) ‘op’ is ’+’ or ‘*’
(b) ‘op’ is ’ \(\uparrow\) ­’ or ‘*’
(c) ‘op’ is ’ \(\uparrow\) ­’ or ‘+’
(d) not possible to evaluate without storing