[amp_mcq option1=”only publisher to broker” option2=”only broker to publisher” option3=”publisher to broker and broker topublisher” option4=”server to client” correct=”option3″]
The correct answer is: C. publisher to broker and broker to publisher.
A publish command message is sent from a publisher to a broker, and the broker then sends the message to all subscribers.
Option A is incorrect because the broker does not send the message to the publisher.
Option B is incorrect because the publisher does not send the message to the broker.
Option D is incorrect because the server does not send the message to the client.