a$.$ Describe the output of this logic circuit when the select line S is a logical $0.(4$ points$)$

That is$,$ what is the output Z for each value of A$?$

b$.$ If the select line S is switched from a logical $0$ to $1,$ what will the output be$?(4$ points$)$

c$.$ Is this logic circuit a storage element? $(2$ points$)$