最大可信事故是指在所有预测的概率( )的事故中，对环境(或健康)危害最严重的重大事故。

A．为零

B．大于1

C．不为零

D．大于或等于1

Some forward contracts are termed cash settlement contracts. This means:()

A. either the long or the short in the forward contract will make a cash payment at contract expiration and the asset is not delivered. 

B. at settlement, the long purchases the asset from the short for cash. 

C. at contract expiration, the long can buy the asset from the short or pay the difference between the market price of the asset and the contract price.