Youareperfomingsecuritytestingonanexistingasp.netwebpage.Younoticethatyouareabletoissueunauthorisedpostbackrequeststothepage.Youneedtopreventunauthorisedpostbackrequests.whichpagedirectiveyouuse?()

A.<%@Pagestrict="true"%>

B.<%@PageenableViewStateMac="true"%>

C.<%@PageEnableEventValidation="true"%>

D.<%@PageAspcompact="true"%>