Question: What is the primary purpose of the 'New-Serial-Number' parameter in Cell Broadcast Service (CBS)?
Option 1: To authenticate the User Equipment (UE) for CBS messages
Option 2: To indicate the priority level of a CBS message
Option 3: To signal a change in the CBS message, identifying a new version of the message
Option 4: To specify the geographical area for which the CBS message is intended
Explanation: The 'New-Serial-Number' parameter is altered every time the CBS message is changed, allowing identification of a new version of a particular CBS message, ensuring receivers can detect updates efficiently.