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Question:
What are some of the major architectural differences exist between 3G and 4G?

Option A):
The RNC acts as a BS in a cluster-type RAN configuration
Option B):
The circuit-switching elements are removed in 4G
Option C):
All of the Above
Option D):
A VOIP Gateway is used to connect to the PSTN and ISDN networks

Correct Answer is Option C):
All of the Above