Which action is taken on a message when CRES is unavailable?

Email encryption is configured on a Cisco ESA that uses CRES.
Which action is taken on a message when CRES is unavailable?
A. It is requeued.
B. It is sent in clear text.
C. It is dropped and an error message is sent to the sender.
D. It is encrypted by a Cisco encryption appliance.

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