&lt;?php$y = 2;if &#40;**$y == 4&#41;&#123;    echo $y;&#125;?&gt;
A. 4
B. 2
C. error at line2
D. no output
Answer:A
&lt;?php$y = 2;if &#40;**$y == 4&#41;&#123;    echo $y;&#125;?&gt;
A. 4 B. 2 C. error at line2 D. no output
Explanation: The ** is not a valid operator,only ++ and — exist.