The packet flow for new traffic on SRX is processed in a defined order:

Screens (Option B, Step 1): Packets are first checked by screens for anomalies such as floods, malformed packets, or protocol violations.

Route Lookup (Step 2): The destination IP is checked in the routing table to determine the egress interface.

Zone Determination (Step 3): Once the ingress and egress interfaces are known, their associated zones are identified.

Security Policies (Step 4): With both zones determined, the packet is evaluated against the configured security policies.

Other options list incorrect sequences, either moving routing later or placing policies before zone determination, which is not possible.

Correct Processing Order: screens → routes → zones → security policies