What security filter will assign security to hierarchy, filtering the members displayed to end users?

What security filter will assign security to hierarchy, filtering the members displayed to end
users?

A.
Read Filter

B.
Write Filter

C.
Metaread Filter

D.
Metadata Filter

E.
Not possible to secure dimensions; only data can be secured

Explanation:
http://www.rittmanmead.com/2011/04/oracle-bi-ee-11g-decoding-essbaseconnectivity-part-
5-security/http://forums.oracle.com/forums/thread.jspa?threadID=1030843