Which of the following statements is true regarding SGSN when serving a 2G network?

Which of the following statements is true regarding SGSN when serving a 2G network?

A.
In the 2G environment, the SGSN must connect to the BSS via a “physical” circuit

B.
None of the management tasks that are handled in 3G environment by the RNC are asked to the SGSN in the 2G environment.

C.
Less is required for the SGSN when it is serving a 2G network.

D.
The SGSN communicates with the RNC when serving a 2G network.
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