单项选择题

A.session.removeAll（USE_CASE_ATTRS）；B.for （ String attr……

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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