Assumethecustomtagmy:errorPronealwaysthrowsajava.lang.RuntimeExceptionwiththemessage"

Assumethecustomtagmy：errorPronealwaysthrowsajava.lang.RuntimeExceptionwiththemessage"Filenotfound."AnerrorpagehasbeenconfiguredforthisJSPpage.Whichoptionpreventstheexceptionthrownbymy：errorPronefrominvokingtheerrorpagemechanism，andoutputsthemessage"Filenotfound"intheresponse？（）

A.<c：trycatch="ex"><my：errorProne/></c：try>${ex.message}

B.<c：catchvar="ex"><my：errorProne/></c：catch>${ex.message}

C.<c：try>.<my：errorProne/>.</c：try>.<c：catchvar="ex"/>.${ex.message}

D.<c：try>.<my：errorProne/>.<c：catchvar="ex"/>.${ex.message}.</c：try>