多项选择题
Given that a scoped attribute cart exists only in a user’s session， which two， taken independently， ensure the scoped attribute cart no longer exists？（）
B. <c：remove var="cart" />
C. <c：remove var="${cart}" />
D. <c：remove var="cart" scope="session" />
E. <c：remove scope="session">cart</c：remove>
F. <c：remove var="${cart}" scope="session" />
G. <c：remove scope="session">${cart}</c：remove>
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Whichinterfacemustaclassimplementsothatinstancesoftheclassarenotifiedafteranyobjectisaddedtoasession？（）
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