When Trying to Subscribe to an MQTT Broker on the Internet

Multiple Choice

When trying to subscribe to an MQTT broker on the internet, the MQTT client is on a private subnet and must be NATed to reach the public broker. What is the expected outcome when this configuration is in place?

A) The client periodically reconnects to the default gateway.
B) The client connects only once using the PENDING message to the broker.
C) The client periodically reconnects to the broker over the NAT connection.
D) The client connects only once using the CONNECT massage to the broker.