" Regular way " settlement refers to the standard settlement cycle for securities transactions, which is T+2 for most stocks and bonds. This timeline is set by regulators to ensure orderly processing of trades.

D is correct because regular way settlement follows the preset T+2 cycle.

A is incorrect because cash settlement occurs the same day as the trade.

B is not a recognized term for settlement types.

C is incorrect because next-day settlement applies only to specific securities (e.g., Treasury securities).