When using the MQTTPublish Node to route messages, how can it be determined if the message was published successfully?

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

View Answer

Answer: D