What is true regarding the command sendmail?

What is true regarding the command sendmail?

A.
The sendmail command prints the MTAs queue history of which mails have been sent successfully.

B.
It is only available when the sendmail MTA is installed.

C.
All MTAs, including Postfix and Exim, provide a sendmail command.

D.
With any MTA, the sendmail command must be run periodically by the cron daemon.