You are configuring an active/passive cluster of SRX Series devices as the firewall enforcer on a MAG Series device.Which statement is true?（）

• A、Multiple Infranet Enforcer instances are created with a single serial number of an SRX Series device defined in each configuration.
• B、A single Infranet Enforcer instance is created with both serial numbers of the clustered SRX Series devices defined in the configuration.
• C、Multiple Infranet Enforcer instances are created with a single IP address of an SRX Series device defined in each configuration.
• D、A single Infranet enforcer instance is created with the VIP of the clustered SRX Series device defined in the configuration.