单选题Which type of firewall is needed to open appropriate UDP ports required for RTP streams？（）AStateful firewallBProxy firewallCPacket filtering firewallDStateless firewall
单选题
Which type of firewall is needed to open appropriate UDP ports required for RTP streams？（）
A
Stateful firewall
B
Proxy firewall
C
Packet filtering firewall
D
Stateless firewall
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解析：
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