For an $8-$bit operand, specify the $8-$bit mask and the logical operator to perform the following operations. Bit positions are numbered $7-0,$ left to right.

a$.$ Clear all bits to $0.$

Logical Operator:

Logical Mask:

b$.$ Complement bits $3,2,1,$ and $0.$ All other bits remain unchanged.

Logical Operator:

Logical Mask:

c$.$ Clear bits $7$ and $6$ to $0.$ All other bits remain unchanged.

Logical Operator:

Logical Mask:

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

Logical Operator:

Logical Mask: