下列对信用证有效期的描述,属于直接写明具体日期的是()
A、Documents must be presented for negotiation within 10 days after the on board date ofbill of lading
B、Negotiation must be on or before the 15th day of shipment
C、This L/C is valid for negotiation in China until Oct. 1, 2002
D、Documents to be presented to negotiation bank within 15 days after shipment