Question: What is the implication of receiving a NULL list in the `versionNumbersList` field within the `GetNotificationIRPVersionReply` for the `getNotificationIRPVersion` action in a Telecommunication Management context?
Option 1: The Agent supports only the latest version of the Notification IRP.
Option 2: The concerned Agent does not support any version of the Notification IRP.
Option 3: The Manager needs to retry the `getNotificationIRPVersion` action with updated parameters.
Option 4: The Agent is currently undergoing maintenance and will support versions shortly.
Explanation: According to the defined behavior for `getNotificationIRPVersion`, a NULL list in the `versionNumbersList` indicates that the concerned Agent does not support any version of the Notification IRP. This is crucial for Managers to understand the capabilities of Agents in the network, ensuring compatibility and effective management.