Question: What is the primary factor influencing the file size of the EF (Elementary File) for EFCBMI (Cell Broadcast Message Identifier Selection) in a USIM (Universal Subscriber Identity Module)?
Option 1: Type of Cell Broadcast messages supported by the UE (User Equipment)
Option 2: Total storage capacity of the USIM
Option 3: Number of simultaneous connections supported by the UE
Option 4: Number of Cell Broadcast message identifier records defined
Explanation: The file size for EFCBMI is directly proportional to the number of Cell Broadcast message identifier records, as each record defines a type of Cell Broadcast message accessible by the UE. This relationship indicates that the primary factor influencing file size is indeed the number of such records.