What Quality of Service (QoS) can developers set on the published MQTT messages from their loT devices to the Watson loT Platform so that a message is received exactly once?

What Quality of Service (QoS) can developers set on the published MQTT messages from their loT devices to the Watson loT Platform so that a message is received exactly once?
A . QoS 0
B . QoS 1
C . QoS 2
D . QoS 3

View Answer

Answer: C