What should you do?

You want to send and consume Cloud Pub/Sub messages from your App Engine application. The Cloud Pub/Sub API is currently disabled. You will use a service account to authenticate your application to the API. You want to make sure your application can use Cloud Pub/Sub.

What should you do?
A . Enable the Cloud Pub/Sub API in the API Library on the GCP Console.
B . Rely on the automatic enablement of the Cloud Pub/Sub API when the Service Account accesses it.
C . Use Deployment Manager to deploy your application. Rely on the automatic enablement of all APIs used by the application being deployed.
D . Grant the App Engine Default service account the role of Cloud Pub/Sub Admin. Have your application enable the API on the first connection to Cloud Pub/Sub.

Answer: A

Explanation:

Quickstart: using the Google Cloud Console

This page shows you how to perform basic tasks in Pub/Sub using the Google Cloud Console.

Note: If you are new to Pub/Sub, we recommend that you start with the interactive tutorial.

Before you begin

Set up a Cloud Console project.

Set up a project

Click to:

Create or select a project.

Enable the Pub/Sub API for that project.

You can view and manage these resources at any time in the Cloud Console.

Install and initialize the Cloud SDK.

Note: You can run the gcloud tool in the Cloud Console without installing the Cloud SDK.

To run the gcloud tool in the Cloud Console, use Cloud Shell.

https://cloud.google.com/pubsub/docs/quickstart-console