How can an administrator meet this requirement ?

An administrator has created content types for Salesforce CRM Content and has been asked to restrict the content types that are m a library.

How can an administrator meet this requirement ? Choose 2 answers
A . Add the default content type to the Selected Content Types list.
B . Add the Related Content related list to the page layout for the associated object.
C . Add members to the library who are users or members of public groups.
D . Select the "Restrict the content types available in the library" checkbox.

Answer: A,C