Step by Step Explanation:
* SEC Rule 10b-10: Requires trade confirmations to disclose the capacity in which the firm acted (e.g., as agent or principal) and details like trade price, quantity, and commissions.
* Incorrect Options:
* A: Cost basis is not disclosed on trade confirmations.
* B: Inventory levels are not part of the required disclosures.
* C: Market maker status is not explicitly required in the confirmation.
References:
* SEC Rule 10b-10 (Confirmation Requirements): SEC Rule 10b-10.