Refer to the exhibit.

Which two statements about MQTT messaging are true? (Choose two.)

Select all that apply.

• 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 TCP.

• D

  Result code 0 means the connection is accepted; result code 5 means the connection is "refused, not
  authorized".

• E

  Brokers can send the Last Will and Testament messages on behalf of the client.