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>
正确答案:B,D
答案解析:有
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