Question: In a Cell Broadcast Service (CBS) as per 3GPP specifications, which entity is associated with using the 'SAI (Service Area Identifier)' format for a cell identifier in responses to the Cell Broadcast Centre (CBC)?
Option 1: Base Station Controller (BSC)
Option 2: Radio Network Controller (RNC)
Option 3: Cell Broadcast Centre (CBC) itself
Option 4: Mobile Switching Centre (MSC)
Explanation: In the context of CBS and as per the described cell identifier formats, the Radio Network Controller (RNC) is specifically mentioned to utilize the 'SAI (Service Area Identifier)' format for a cell identifier when responding to the CBC. This highlights the RNC's role in managing radio resources and its interaction with the CBC for broadcasting services, underscoring the importance of standardized communication protocols between these entities in telecom networks.