Which of the following statements is true regarding PDP context deletion?

A.
Context Response messages are sent to the Cisco GGSN.

B.
The SGSN removes the PDP context from memory and returns a Delete PDP message.

C.
The Cisco GGSN sends a Delete PDP Context Request message to the SGSN to
facilitate the data session.

D.
The SGSN returns a Deactivate PDP Context Accept message to the mobile station