Which three statements are true?

You performed an incremental level 0 backup of a database: Which three statements are
true?

A.
Backup change tracking will sometimes reduce I/O performed during cumulative
incremental backups.

B.
The change tracking file must always be backed up when you perform a full database
backup.

C.
Block change tracking will always reduce I/O performed during cumulative incremental
backups.

D.
More than one database block may be read by an incremental backup for a change
made to a single block.

E.
The incremental level 1 backup that immediately follows the enabling of block change
tracking will not read the change tracking file to discover changed blocks.