The following circuit is:

a$.$ Decoder

b$.$ Multiplexer

c$.$ DeMultiplexer

d$.$ Encoder

The following circuit is a circuit:

a$.$ Combinational

b$.$ Sequential

c$.$ Encoder

d$.$ Binary Adder

A binary adder can be designed using:

a$.$ Full adder

b$.$ DeMultiplexer

c$.$ Encoder

d$.$ Binary substractor

The simplest equation which implements the K$-$map shown below is:

$\backslash$table$[[,C^{\text{'}},C$