The following is an excerpt from a procmail configuration file: :0 c * ! ^To: backup ! backup
Which of the following is correct?

A.
All mails will be backed up to the path defined by $MAILDIR

B.
Mails not addressed to backup are passed through a filter program named backup.

C.
A copy of all mails will be send to the local email address backup.

D.
All mails to the local email address backup will be stored in the directory backup.

E.
A copy of all mails will be stored in file backup.