Host A opens a Telnet connection to Host B. Host A then

单项选择题

Host A opens a Telnet connection to Host B. Host A then opens another Telnet connection to Host B. These connections are the only communication between Host A and Host B. The security policy configuration permits both connections.
How many sessions exist between Host A and Host B?（）

A.1
B.2
C.3
D.4

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多项选择题 Which two content-filtering features does FTP support?（） (Choose two.)

JN0-130