Given the $16-$bit operand $1010110001010011,$ what operation must be performed and what operand must be used:

$($a$)$ clear all odd bit positions to $0?($Assume bit positions are $15$ through $0$ from left to right.$)$

$($b$)$ set the rightmost $4$ bits to $1?$

$($c$)$ complement the most signiicant $8$ bits?