When using the MQTTPublish Node to route messages, how can it be determined if the message was published successfully?
A . Check the Boolean in LocalEnvironemnt.Destination.MQT
B . Output.retained in a node wired to the Out terminal of the MQTTPublish Node
C . Check the Boolean in LocalEnvironemnt.WrittenDestination.MQT
D . Output.retained in a node wired to the Out terminal of the MQTTPublish Node
E . Check the Boolean in LocalEnvironemnt.Destination.MQT
F . DeliveryToken.is Complete in a node wired to the Out terminal of the MQTTPublish Node
G . Check the Boolean in LocalEnvironemnt.WrittenDestination.MQT
H . DeliveryToken.is Complete in a node wired to the Out terminal of the MQTTPublish Node
Answer: D