Question $2(3$ points$)$

Select the true statements.

An $8-$bit counter can be constructed with two $4-$bit counters and one inverter.

A $38$ decoder has $24$ output lines.

A sequential circuit cannot be built with gates.

A full adder can be constructed with two half adders and an OR gate.

A half adder can be constructed with exactly $4$ NAND gates.

A $32-$bit register can be constructed with four $8-$bit registers.

Question $3(3$ points$)$

$$ Saved

Determine whether each of the following circuits is combinatorial or sequential.

Full adder

Half adder

Decoder

Combinatorial

Flip$-$flop

Sequential

Counter

Register