Question: In the context of Mobile Application Part (MAP) for Gateway Location Register (GLR), what is the purpose of the `MAP-U-ABORT` service, which has been replaced in a specific scenario?
Option 1: To establish secure transport class 1 connections between network elements.
Option 2: To abort an ongoing MAP dialogue due to a user-initiated request or a local network reason.
Option 3: To provide notice of an error condition to the peer MAP user.
Option 4: To close an existing MAP dialogue normally after completion.
Explanation: The `MAP-U-ABORT` service is typically used for aborting an ongoing MAP dialogue. This can occur due to a user-initiated request (e.g., cancellation of an operation by the user) or a local reason within the network (e.g., resource unavailability). This service allows for the graceful or forced termination of a dialogue, depending on the context, which is crucial for managing and maintaining efficient communication between network elements in telecom systems.