下面关于数字签名的说法错误的是______。

A．能够保证信息传输过程中的保密性

B．能够对发送者的身份进行认证

C．如果接收者对报文进行了篡改，会被发现

D．网络中的某一用户不能冒充另一用户作为发送者或接收者

A forward rate agreement (FRA) :()

A. must consider the creditworthiness of the parties making the deal when determining the rate. 

B. requires the long to pay cash to the short if the rate specified in the contract at expiration is below the current floating rate. 

C. can sometimes be viewed as the right to borrow money at below-market rates.