【单选题】
Assume the custom tag my：errorProne always throws a java.lang.RuntimeException with the message "Filenot found." An error page has been configured for this JSP page.<br /> Which option prevents the exceptionthrown by my：errorProne from invoking the error page mechanism， and outputs the message "File notfound" in the response？（）
A、<c：try catch="ex"><my：errorProne /></c：try>${ex.message}
B、<c：catch var="ex"><my：errorProne /></c：catch>${ex.message}
C、<c：try>. <my：errorProne />. </c：try>. <c：catch var="ex" />. ${ex.message}
D、<c：try>. <my：errorProne />. <c：catch var="ex" />. ${ex.message}. </c：try>
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