Question: When sending a `WRITE-REPLACE-WARNING-REQUEST` to the MME, which of the following Information Elements (IEs) may be used but shall not be used when sent to the PWS-IWF?
Option 1: List of NG-RAN TAIs IE, Warning Area List NG-RAN IE
Option 2: Global RAN Node ID IE, RAT Selector NG-RAN IE
Option 3: List of TAIs IE, Warning Message Content E-UTRAN IE, Global eNB ID IE
Option 4: Extended Repetition Period IE, Number of Broadcasts Requested IE
Explanation: According to specifications for the `WRITE-REPLACE-WARNING-REQUEST` primitive, when sent to the MME, it may include List of TAIs IE, Warning Message Content E-UTRAN IE, and Global eNB ID IE. However, these elements shall not be used when directed to the PWS-IWF, highlighting the distinction in protocol handling between MME and PWS-IWF for Cell Broadcast Service (CBS) operations.