What two methods are used to set up the integration between Active Directory, Cisco Unified CM, and IM&P?

A customer has a single Active Directory domain with users in various email domains. Each user is
associated to only one email domain. The customer wants their users to federate to external
organizations using their email addresses. What two methods are used to set up the integration
between Active Directory, Cisco Unified CM, and IM&P? (Choose two.)

A.
CUCM LDAP Attribute for User ID set to sAMAccountName, CUCM LDAP Directory URI set to mail,
IM Address Scheme set to Directory URI

B.
CUCM LDAP Attribute for User ID set to mail, IM Address Scheme set to User ID

C.
CUCM LDAP Attribute for User ID set to sAMAccountName, CUCM LDAP Directory URI set to
msRTCSIP-primaryuseraddress, IM Address Scheme set to Directory URI

D.
CUCM LDAP Attribute for User ID set to mail, CUCM LDAP Directory URI set to mail, IM Address
Scheme set to Directory URI

E.
CUCM LDAP Attribute for User ID set to mail, IM Address Scheme set to mail