Consider the following K$-$Map $($Karnaugh Map$)$ for boolean function

F$($W$,$X$,$Y$,$Z$)=\backslash$Sigma m$(1,3,4,5,6,7,12,14)$

The number of prime implicants $=$

The two essential prime implicants are $=$

$($in the format of xxx$,$ beginning with W$),$ and $=$

$($in the format of xxx$,$ beginning with X$)$

The only redundant prime implicant is $=$

$($in the format of xxx$,$ beginning with W$)$

The number of selective prime implicants $=$