Shortfall Placed a Market Order to Buy 100 Shares of Google

Shortfall placed a market order to buy 100 shares of Google (GOOG) with GetErDone Broker-Dealers. The market order was executed at $530 a share. In accordance with Regulation T:

A) Mr. Shortfall must pay for the purchased shares within 3 business days.
B) Mr. Shortfall must pay for the purchased shares within 5 business days.
C) GetErDone can request an extension from FINRA or another SRO for Mr. Shortfall if he is unable to pay for the shares within 5 business days.
D) Both B and C are true statements.