Which two functionalities does an update PDP context request sent from the GGSN to the SGSN provide?

Which two functionalities does an update PDP context request sent from the GGSN to the SGSN provide? (Choose two.)
A. Provide a PDP address to the MS.
B. Check that the PDP context is active.
C. Delete a PDP context from the SGSN.
D. Establish a network-requested secondary PDP context activation procedure.
E. Establish a network-requested primary PDP context activation procedure.