Adding interfaces (Option A): An interface must be assigned to a security zone before it can pass traffic. By default, interfaces are in the null zone and cannot send or receive traffic.
Exception traffic (Option B): Security zones define host-inbound-traffic settings, which determine what types of management or control-plane traffic (SSH, ICMP, SNMP) are permitted.
Routing instances (Options C and D): Security zones are specific to a routing instance and cannot include interfaces from multiple instances. Therefore, interfaces in the same zone cannot belong to different routing instances.
Correct Statements: A and B
[Reference: Juniper Networks – Security Zones Overview, Junos OS Security Fundamentals., ]
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