Which two statements are true regarding SecureFile lobs? 

Answer options:

A. The amount of undo retained is user controlled.
B. They can be used only for nonpartitioned tables.
C. Fragmentation is minimized by using variable-sized chunks.
D. They support random reads and writes of encrypted LOB data.

CD

Reference: http://docs.oracle.com/cd/E11882_01/appdev.112/e18294/adlob_smart.htm#ADLOB46113