Question: What action does a Node B take if it receives an MBMS NOTIFICATION UPDATE COMMAND message without a Modification Period IE and has no stored Modification Period?
Option 1: Ignore the message and continue with current settings
Option 2: Automatically include a default Modification Period
Option 3: Request clarification via an additional query message
Option 4: Initiate the Error Indication procedure
Explanation: This is because, as per the specified behavior for such a scenario, the absence of both the Modification Period IE in the received message and any stored value on the Node B triggers an error condition. The Node B's response to this error condition is to initiate the Error Indication procedure, ensuring the issue is promptly addressed to maintain operational integrity.