Which three characteristics of a Skinny table help improve report and query performance?

Which three characteristics of a Skinny table help improve report and query performance?
A . Skinny tables can contain frequently used fields and thereby help avoid joins.
B . Skinny tables can be used to create custom indexes on multi-select picklist fields.
C . Skinny tables provide a view across multiple objects for easy access to combined data.
D . Skinny tables are kept in sync with changes to data in the source tables.
E . Skinny tables do not include records that are available in the recycle bin.

Answer: A,C,D