Question: What is the maximum number of groups to which a single phone book entry can be assigned, as per the structure defined for the EFGRP (Grouping file) in a USIM application?
Option 1: Up to 5 groups
Option 2: Up to 10 groups
Option 3: Up to 20 groups
Option 4: No limit, dynamically allocated
Explanation: According to the specifications for the EFGRP file in a USIM application, each entry can be assigned to a maximum of 10 groups. This is a deliberate design choice to balance flexibility with storage efficiency within the constraints of the USIM's data storage capabilities. Exceeding this limit could lead to data management issues or require additional, potentially complex, workarounds.