A digital system has a common bus system for $32$ registers of $16$ bits each, then the number of multiplexers needed for such design are:

a$)16(321)$

b$)32(161)$

c$)32(321)$

d$)16(161)$

In order to execute the following microoperation DRlongleftarrowM$[AR],$ the following signals should be activated

a$)S(011),$read$(M),LD(DR)$

b$)S(011),$ write$($M$),LD(DR)$

c$)S(111),$ write$($M$),LD(DR)$

d$)S(111),$read$(M),LD(DR)$

The following control statement:

$"$If $($A$=0)$ then $($DR longleftarrowM$[AR]$ else if $)=(1$ then $(M[AR]larrDR)"$ could be represented as the following: