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多选题
Given that a scoped attribute cart exist only in a user’s session， which two， taken independently， ensure the scoped attribute cart no longer exists？（）
A
${cart = null }
B
<c：remove var=”cart” />
C
<c：remove var=”${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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The object of the manager attribute should implement the HttpSessionListener and it should call the removeAttribute method on the appropriate session attributes.C
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