Which Of These Statements About The Publisher-Subscriber Pattern Utilized By Cloud Pub/Sub Is TRUE?

Which Of These Statements About The Publisher-Subscriber Pattern Utilized By Cloud Pub/Sub Is TRUE?
  • Publisher applications can receive messages from a topic.
  • Subscriber applications can subscribe to a topic to receive the message when the subscriber is ready.
  • Publisher applications can send messages to a subscriber.
  • Subscriber applications can send messages on a topic directly to publisher applications.