Question $4($a$)$ Distinguish the data storage features, stored data modification abilities, data access processing, and the interconnections with central processing unit between the random access memory and read only memory. $(11$ marks$)($b$)$ Elaborate the functions of ripple and synchronous counters individually, and analyse both of their advantages and disadvantages. Based on the analysis, evaluate and decide which one of these counters has the better attributes. $(14$ marks$)$