For an $8-$bit operand, specify the $8-$bit mask and the logical operator to perform the following operations. Bit positions are number $0,$ left to right.

a$.(5$ points$)$ Set all bits to $1.$

Logical Operator:

Logical Mask:

b$.$ Complements bits, $7,6,5,$and $4.$ All other bits remain unchanged

c$.$ Set bits $3,2,1,$ and $0$ to $1.$ All other bits remain unchanged

d$.$ Clear bits $7,6,5,4$ to $0.$ All other buts remain unchanged.

Logical Operator:

Logical Mask: