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>