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多选题
Given that a scoped attribute cart exists only in a user’s session, which two,taken independently,ensurethe 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>


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