$12.$Assume that x and y are boolean variables and have been properly initialized. $($x && y$)$ && $!($x $||$ y$)$

Which of the following best describes the result of evaluating the expression above?

$($A$)$ true always

$($B$)$ false always

$($C$)$ true only when x is true and y is true

$($D$)$ true only when x and y have the same value

$($E$)$ true only when x and y have different values