Which policy will this packet match?

The SRX Series device is configured for source NAT. The source IP address will be translated to 1.1.1.1. A packet with a source address of 21.21.21.21 and destination address of 31.1.1.1 arrives at the SRX Series device.

Which policy will this packet match?

A.
a policy in which the match criteria has a source address of 21.21.21.21 and a destination- address of 31.1.1.1

B.
a policy in which the match criteria has a source address of 1.1.1.1 and a destination address of 21.21.21.21

C.
a policy in which the match criteria has a source address of 21.21.21.21 and a destination address of 1.1.1.1

D.
a policy in which the match criteria has a source address of 31.1.1.1 and a destination address of 1.1.1.1