What is the purpose of Mobile and Remote Access (MRA) in the Cisco UCM architecture?

What is the purpose of Mobile and Remote Access (MRA) in the Cisco UCM architecture?
A . MRA is used to access Webex cloud services only if authenticated with on-premises LDAP service.
B . MRA is used to make secure PSTN calls by Cisco UCM only while on-premises authentication.
C . MRA is used to make B2B calls through Expressway registration.
D . MRA is used to access the collaboration services offered by Cisco UCM from off-premises network connections

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Answer: D