Which two statements about the PMM-DETACHED state are true?

Which two statements about the PMM-DETACHED state are true? (Choose two.)
A. The Mobile Subscriber and SGSN contexts hold no valid location or routing information for the Mobile Subscriber.
B. The Mobile Subscriber location is known in the 3G SGSN with an accuracy of a serving RNC.
C. The serving RNC tracks the location of the Mobile Subscriber.
D. A 3G SGSN cannot reach the Mobile Subscriber location because the location is unknown.
E. Signaling towards the HLR is needed if the 3G SGSN does not have an MM context for this Mobile Subscriber.
F. The Mobile Subscriber performs a routing area update if the routing area changes.

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