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單項(xiàng)選擇題

One of the use cases in your web application uses many session-scoped attributes. At the end of the usecase,you want to clear out this set of attributes from the session object. Assume that this static variableholds this set of attribute names:
201.private static final Set USE_CASE_ATTRS; 
202.static {
203.USE_CASE_ATTRS.add("customerOID");
204.USE_CASE_ATTRS.add("custMgrBean");
205.USE_CASE_ATTRS.add("orderOID");
206.USE_CASE_ATTRS.add("orderMgrBean");
207.}
Which code snippet deletes these attributes from the session object?()

A.session.removeAll(USE_CASE_ATTRS);
B.for ( String attr : USE_CASE_ATTRS ) {session.remove(attr);}
C.for ( String attr : USE_CASE_ATTRS ) {session.removeAttribute(attr);}
D.for ( String attr : USE_CASE_ATTRS ) {session.deleteAttribute(attr);}
E.session.deleteAllAttributes(USE_CASE_ATTRS);

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