Which two parameters does the Cisco ASR 5000 PGW use to generate the subscriber ID for IP address allocation?

The IP pools that are configured on the Cisco ASR 5000 are used for address allocation.
AAA and DHCP have not been enabled from the PGW.
Which two parameters does the Cisco ASR 5000 PGW use to generate the subscriber ID for
IP address allocation? (Choose two.)

A.
IMEI

B.
MSISDN

C.
EPS bearer ID

D.
IMSI

E.
username