R supports Boolean operations & and && $($logical AND$),|$ and $||($logical OR$),!$ NOT $($logical negation$)$ and, xor$()($function for XOR, exclusive OR$).$ The shorter forms $($& and $|)$ perform comparisons element by element as the arithmetic operations do$.$ The longer forms $($&& and $||)$ evaluate left to right looking only at the first element of each vector; evaluation proceeds only until the result is determined.

If a and b are two logical vectors the

length$($x && y$)$

is equal to

Group of answer choices

$0$

None of the above

length$($y$)$

length$($x$)$

$1$