You Have Cloud Functions Written in Node

Multiple Choice

You have Cloud Functions written in Node.js that pull messages from Cloud Pub/Sub and send the data to BigQuery. You observe that the message processing rate on the Pub/Sub topic is orders of magnitude higher than anticipated, but there is no error logged in Stackdriver Log Viewer. What are the two most likely causes of this problem? Choose 2 answers.

A) Publisher throughput quota is too small.
B) Total outstanding messages exceed the 10-MB maximum.
C) Error handling in the subscriber code is not handling run-time errors properly.
D) The subscriber code cannot keep up with the messages.
E) The subscriber code does not acknowledge the messages that it pulls.