Time left $1$:$11$:$40$

With $8$ bits, totally how many unique values can be represented in unsigned and signed $(2\text{'}$s complement$)$ representations respectively?

Select one:

unsigned: $128$ signed: $256$

unsigned: $256$ signed: $128$

unsigned: $512$ signed: $512$

unsigned: $256$ signed: $256$

unsigned: $512$ signed: $256$