B$.$ Logic Operations

Identify both the mask and the Boolean operation needed to accomplish each of the following objectives. $(5$ pts each$)$

Set the middle four bits of an eigh$-$bit pattern without disturbing the other bits.

Take the complement the MSB of an $8-$bit pattern without changing the other bits.

Clear all but the least significant bit of an $8-$bit pattern without disturbing the least significant bit.

Change an uppercase ASCII code character to its corresponding lowercase code.