Question: What is the maximum number of MBMS SAIs that an MBMS Service Area (MBMS SA) can include?
Option 1: 128
Option 2: 256
Option 3: 512
Option 4: 1024
Explanation: According to the specifications, each MBMS SA shall not include more than 256 MBMS SAIs. This is a key constraint in defining the structure of MBMS Service Areas and ensures that the number of SAIs within an SA remains manageable.