What does the Cisco ASR 5000 PDSN do when subscriber’s authentication is not found in subscriber’s domain alias in source/AAA context?

What does the Cisco ASR 5000 PDSN do when subscriber’s authentication is not found in subscriber’s domain alias in source/AAA context?
A. PDSN rejects the call with Admin Prohibited
B. PDSN selects AAA subscriber default in the context
C. PDSN rejects the call with Insufficient Resources
D. PDSN proceeds without authentication