you need to check the size of a file in php function..., PHP Fundamentals, PHP

Question:you need to check the size of a file in PHP function.
$size=X(filename);
Which function will suitably replace 'X'?

A filesize 
B size 
C sizeofFile 
D getSize

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+ AnswerA

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Question:you need to check the size of a file in PHP function.$size=X(filename);Which function will suitably replace 'X'?