What is causing this behavior?

Your SRX Series device has the following configuration: user@host> show security policies
… Policy: my-policy, State: enabled, Index: 5, Sequence number: 1 Source addresses: any
Destination addresses: any Applications: snmp Action: reject From zone: trust, To zone:
untrust … When traffic matches my-policy, you want the device to silently drop the traffic;
however, you notice that the device is replying with ICMP unreachable messages instead.
What is causing this behavior?

A.
the snmp application

B.
the untrust zone

C.
the reject action

D.
the trust zone