Which prerequisite task must be done before encrypting a connection to an MQTT server?

Which prerequisite task must be done before encrypting a connection to an MQTT server?
A . Create a connection from the MQTT server to the SSL server.
B . Configure the Security identity property on the MQTT server to use encrypted message flow.
C . Configure the MQTT server to communicate using JMT encryption.
D . Create a truststore and import the MQTT server public certificate into the truststore.

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Answer: D