Your production database uses file system storage. You want to move storage to Oracle Automatic Storage Management (ASM). How would you achieve this? 

Answer options:

A. by using a transportable database
B. by using the Database Upgrade Assistant (DBUA)
C. by using Data Pump
D. by using RMAN

D

References: http://docs.oracle.com/cd/E11882_01/server.112/e18951.pdf (p.184)