This is a special WebLogic Server instance included by the WebLogic Server Domains. 
It represents a central point from which you configure and manage all resource domain. （）

A. Coherence uses a more efficient TCMP algorithm going from two to four cache servers
B. When going from one to two cache servers， object backups are copied across servers so work is doubled，but going from two to four is a fixed amount of work
C. Near cache is enabled with a larger quorum thus performance is improved
D. all of the above

A. This option is supported by all type of Garbage collection modes.
B. This option is only supported by Generational Garbage Collection mode.
C. This option is only supported by Mark and Sweep Garbage Collection mode.
D. This option is only supported by Dynamic Garbage Collection mode.