Let $E1=1$ and $E0=0$ and the output be $1$ in the following circuit.

$($a$)(1$ point$)$ What is the value of $A?$

$1$

$0$

No way to know

$($b$)(1$ point$)$ What is the value of $B?$

$0$

No way to know

$($c$)(1$ point$)$ What is the value of $C?$

$1$

$0$

No way to know

$($d$)(1$ point$)$ What is the value of $D?$