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Q5 Single choice

Your developers have created an application that needs to be able to make calls to Cloud Storage and BigQuery. The code is going to run inside a container and will run on Kubernetes Engine and on-premises.

What's the best way for them to authenticate to the Google Cloud services?

A
Create a service account, grant it the least viable privileges to the required services, generate and download a key. Use the key to authenticate inside the application.
B
Use the default service account for App Engine which already has the required permissions.
C
Use the default service account for Compute Engine which already has the required permissions.
D
Create a service account, with editor permissions, generate and download a key. Use the key to authenticate inside the application.

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