a$)$ Briefly describe the ways in which sequential logic differs from combinational logic.

$[4]$

b$)$ Describe the main features that differentiate synchronous from asynchronous sequential logic.

$[4]$

c$)$ Explain fully how each of the following digital devices operate.

i$.$ Encoder

$[3]$

ii$.$ Decoder

$[3]$

iii. Comparator

$[3]$

iv$.$ Full adder

$[3]$