Question: When applying the ATM transport option on the Iu interface for inter-communication between RNC/BSC in a GPRS network, what IP address types must each RNC or BSC support?
Option 1: Only IPv4 addresses
Option 2: Only IPv6 addresses
Option 3: Both IPv4 and optionally IPv6 addresses
Option 4: Neither IPv4 nor IPv6 addresses (using alternative protocols)
Explanation: According to GPRS network specifications, each RNC or BSC must support at least IPv4 addresses and may also optionally support IPv6 addresses, ensuring backward compatibility while allowing for future-proofing with IPv6.