Which RMAN backup command is used to create the block-change tracking file?

Which RMAN backup command is used to create the block-change tracking file?

A.
alter database create block change tracking file

B.
alter database enable block change file

C.
alter database enable block change tracking using file �/ora01/opt/ block_change_tracking.fil�

D.
alter system enable block change tracking using file ‘/ora01/opt/block_ change_tracking.fil’

E.
alter system block change tracking on