Question: What is the maximum number of MBMS Service Area Identities (SAIs) that an MBMS Service Area (SA) can comprise within a Public Land Mobile Network (PLMN)?
Option 1: 128 MBMS SAIs
Option 2: 256 MBMS SAIs
Option 3: 65535 MBMS SAIs (the maximum value of an MBMS SAI)
Option 4: No limit, as long as each cell is uniquely identified
Explanation: According to the specifications for MBMS Service Area definition, each MBMS SA shall not include more than 256 MBMS SAIs. This constraint ensures manageable and efficient grouping of cells within a PLMN for Multimedia Broadcast/Multicast Services.