【单选题】
A Use an OAuth Client ID that uses the https://www.googleapis.com/auth/drive.file scope to obtain an access token for each user.
B Use an OAuth Client ID with delegated domain-wide authority.
C Use the App Engine service account and https://www.googleapis.com/auth/drive.file scope to generate a signed JSON Web Token (JWT)
D Use the App Engine service account with delegated domain-wide authority.
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