What is a communication exception?

What is a communication exception?
A . A type of communication that should not be used for a certain participant
B . A type of communication that results in a template error
C . A one-off communication that is sent to a participant to confirm their registration
D . A communication that does not reach its intended recipient
E . A communication for which no template exists

Answer: A

Explanation:https://www.ibm.com/support/knowledgecenter/SS8S5A_6.0.5/com.ibm.curam.content.doc/

Communications/c_COMM_FeaturesExceptions.html