You are writing a Compute Engine hosted application in project A that needs to securely authenticate to a Cloud Pub/Sub topic in project B. What should you do?

【单选题】
A Configure the instances with a service account owned by project B. Add the service account as a Cloud Pub/Sub publisher to project A
B Configure the instances with a service account owned by project A. Add the service account as a publisher on the topic
C Configure Application Default Credentials to use the private key of a service account owned by project B. Add the service account as a Cloud Pub/Sub publisher to project A.
D Configure Application Default Credentials to use the private key of a service account owned by project A. Add the service account as a publisher on the topic

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