题目内容

下列关于SMTP的叙述中，正确的是()。 (1)只支持传输7比特ASCII码内容 (2)支持在邮件服务器之间发送邮件 (3)支持从用户代理向邮件服务器发送邮件 (4)支持从邮件服务器向用户代理发送邮件

A. 仅(1)、(2)和(3)
B. 仅(1)、(2)和(4)
C. 仅(1)、(3)和(4)
D. 仅(2)、(3)和(4)

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