$($a$)$ Justify THREE $(3)$ individual characteristics of RISC and CISC.

$(12$ marks$)$

$($b$)$ Analyze and describe the concept and functions of direct memory access.

$(5$ marks$)$

$($c$)$ Elucidate the roles of the following microprocessor components:

$($i$)$ arithmetic logic unit $($ALU$)$

$(2$ marks$)$

$($ii$)$ control and timing unit

$(2$ marks$)$

$($iii$)$ register unit

$(2$ marks$)$

$($iv$)$ memory unit

$(2$ marks