Internal participant references are:

• A. Mandatory
• B. Optional
• C. Prohibited
• D. Only for iceberg orders

Answer: (B)

Internal participant references are optional identifiers that a participant may attach to an order or trade to link it to their own internal records, such as a client ticket or reference number. They exist to help reconcile and track activity across back‑office systems, but they are not required by the exchange. The venue will assign its own order and trade identifiers, so a transaction remains fully traceable even without an internal reference. They are not limited to iceberg orders—their use is independent of how an order is displayed or executed. Because they’re optional, different participants may include them or omit them based on their internal processes.