What is the limitation of the Basic IP User Connect License?

What is the limitation of the Basic IP User Connect License?

A.
It is restricted to the Cisco Unified IP Phone 7906 and 7911 models.

B.
One additional softphone is allowed.

C.
It is primarily used for analog migration and restricted to the Cisco Unified IP Phone 6901 and 6911 models.

D.
Only third-party SIP phones with basic call features are supported.