Which code snippet deletes these attributes from the session object?

One of the use cases in your web application uses many session-scoped attributes. At the end of
the use case, you want to clear out this set of attributes from the session object. Assume that this
static variable holds this set of attribute names:

201. private static final Set<String> 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);

Explanation: