Question: What happens to a vCard's 'X-3GPP-GroupUID' field if its referenced group Unique Identifier is deleted from the 'GroupsDefinition.xml' file?
Option 1: The 'X-3GPP-GroupUID' field is automatically updated with a new default group identifier.
Option 2: The vCard is removed from the Contact Manager's database to maintain integrity.
Option 3: The Contact Manager External Client removes the 'X-3GPP-GroupUID' field from the vCard(s).
Option 4: The 'GroupsDefinition.xml' file is updated to reinstate the deleted group Unique Identifier.
Explanation: This action ensures data consistency by removing references to non-existent groups, preventing potential errors or conflicts within the Contact Manager. It aligns with the principle of maintaining database integrity when referenced entities are removed.