What is required to route mail from external internet domains to users in the customer SMTP
domain who are hosted in the IBM SmartCloud Notes service?

A.
A company-controlled SMTP host server configured to accept mail for the internet domain
of the users in the service

B.
An SMTP server in the service configured to accept mail for the internet domain of the
users in the service.

C.
Either an SMTP host server in the service configured to accept mail for the internet
domain of the users in the service or a company-controlled SMTP host server configured to
accept mail for the internet domain of the users in the service and domain verification has
been completed for the internet domain.

D.
An SMTP host server in the service configured to accept mail for the internet domain of
the users in the service and a company-controlled SMTP host server configured to accept
mail for the internet domain of the users in the service.