Which two statements are true about java EE shared libraries?

Which two statements are true about java EE shared libraries?

A.
A shared library cannot be deployed to a cluster.

B.
An application that is targeted to server1 can use a shared library that is targeted to server 2.

C.
Multiple versions of the same shared library can be deployed and be active at the same time

D.
A shared library is referenced through an application’s deployment descriptor.

Explanation:
C: If more than one copy of myLibrary is registered, WebLogic Server selects the
library with the highest specification version. If multiple copies of the library use the selected
specification version, WebLogic Server selects the copy having the highest implementation
version.
D: A Java EE application can reference a registered shared Java EE library using entries in the
application’s weblogic-application.xml deployment descriptor.
Reference: Referencing Shared Java EE Libraries in an Enterprise Application
http://docs.oracle.com/cd/E12840_01/wls/docs103/programming/libraries.html