题目内容

关于签名电子邮件，以下描述正确的是（）。

A. 发信人发送加密邮件时，必须拥有数字证书
B. 安全电子邮件证书一经申请，便不能废除
C. 签名电子邮件可以证明收件人的身份
D. 签名电子邮件不能通过Outlook软件直接接收

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更多问题

What is the goal of the borderless network architecture?（）

A. to provide users with A single device that permits access to information anywhere
B. to provide users with the same productivity and access to information no matter where are or which device they use
C. to eliminate the need for border security and firewalls
D. to provide companies with A way to extend their security and control over employees on the internet

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