Which two statements about MQTT messaging are true?

Refer to the exhibit.

Which two statements about MQTT messaging are true? (Choose two.)
A . Result code 5 means the connection is accepted; result code 0 means the connection is "refused, not authorized".
B . Redundant ClientIDs are supported by MQTT brokers.
C . MQTT does not support a "keep alive" functionality because it runs on top of TC
E . Result code 0 means the connection is accepted; result code 5 means the connection is "refused, not authorized".
F . Brokers can send the Last Will and Testament messages on behalf of the client.

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Answer: DE