Immediately after Registration, how does an Avaya SIP telephone learn if any of its Call Forward features are active right now?

Immediately after Registration, how does an Avaya SIP telephone learn if any of its Call Forward features are active right now?
A . It queries the LDAP database for active feature status.
B . It sends a Subscribe – avaya-cm-feature-status event package to Aura® Communication Manager (CM) via Aura® Session Manager (SM).
C . It sends a PPM getDeviceData request to Aura® Session Manager (SM); Aura® Session Manager (SM) replies with a getDeviceData response.
D . It sends a Subscribe – avaya-ccs-profile event package to Aura® Session Manager (SM); Aura® Session Manager (SM) in turn replies with a Notify-avaya-ccs-profile.

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Answer: B