Explanation:
On GCE, Application Default Credentials (ADC) automatically use the instance's attached service account tokens from the metadata server. No keys needed, secure. OAuth for users, keys for service accounts manually.
Ultimate access to all questions.
A Compute Engine app needs to call Google APIs as its attached service account. Which credentials mechanism does the client library use automatically?
A
A JSON key on disk
B
Application Default Credentials via the metadata server
C
OAuth consent screen
D
API keys
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