Which two statements apply during the attach procedure on an MME? (Choose two.)

A.
The attach procedure provides an always-on IP connectivity to the subscriber.

B.
Multiple default bearers can be established during the attach procedure.

C.
A dedicated bearer can also be established during the attach procedure.

D.
The additional guti value in the attach request is derived from a PTMSI.

E.
The attach request is always integrity protected.