Question: In which scenarios, beyond directly supporting its own customers, can an IP Multimedia Subsystem (IMS) be utilized according to 3GPP specifications?
Option 1: Exclusively for intra-network optimization of multimedia services.
Option 2: Solely for interconnecting with other IMS networks for roaming purposes.
Option 3: In various configurations, including supporting CS domain customers and facilitating interconnection with other networks in different business arrangements.
Option 4: Only for providing voice over LTE (VoLTE) services to partner networks.
Explanation: This option correctly reflects the flexibility of IMS beyond direct customer support. It encompasses supporting CS domain customers and facilitating interconnections in various business arrangements, highlighting IMS's versatile role in telecom networks for both service provision and network interoperability.