In terminal digit filing, which digits are used from the SSN?

• A. The first two digits of the SSN.
• B. The middle two digits of the SSN.
• C. The last two digits in the member's SSN.
• D. The full SSN.

Answer: (C)

Terminal digit filing organizes records by the ending portion of the SSN. The digits at the end—the last two digits—are used to create the primary index, with the digits that come before them used as a secondary sort within that terminal-digit group. This approach helps distribute files evenly across the filing system and keeps full SSNs from being used for routine filing.

So, the digits used from the SSN are the last two digits. Using the first two would cluster by the initial portion of the number, middle two would be a different filing scheme (middle-digit filing), and using the full SSN would reveal too much information for everyday filing.