Which of these statements about the Publisher-Subscriber pattern utilized by Cloud Pub/Sub is TRUE?

1. Publisher applications can receive messages from a topic.
2. Subscriber applications can subscribe to a topic to receive the message when the subscriber is ready.
3. Publisher applications can send messages to a subscriber.
4. Subscriber applications can send messages on a topic directly to publisher applications.

Correct Answer:

• Subscriber applications can subscribe to a topic to receive the message when the subscriber is ready.