How is the default e-mail address in the E-mail Subsystem Configuration page used?

How is the default e-mail address in the E-mail Subsystem Configuration page used?

A.
It receives all mail sent in the Send E-mail step as a bcc.

B.
It is used if no e-mail contact is specified in the Create E-mail step.

C.
It becomes the From address in the Send E-Mail step if no address is specified.

D.
It automatically receives alarms generated by the Cisco CRS Server.