单项选择题

Which statement is true regarding IPsec VPNs?（）

A. There are five phases of IKE negotiation.
B. There are two phases of IKE negotiation.
C. IPsec VPN tunnels are not supported on SRX Series devices.
D. IPsec VPNs require a tunnel PIC in SRX Series devices.

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If both nodes in a chassis cluster initialize at different times, which configuration example will allow you to ensure that the node with the higher priority will become primary for your RGs other than RG0?（）

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