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Answer: Pull Request
**Option B (Pull Request)** is correct because it cannot be used to trigger builds in Cloud Build when using Cloud Source Repositories. **Option A (Push to a branch)** is incorrect as it can trigger Cloud Build upon code pushes to specified branches. **Option C (Push new tag)** is also incorrect since pushing a new tag to any branch can trigger builds. **Option D (Manual invocation)** is incorrect because Cloud Build supports manual triggering for builds in the repository. For more details, refer to [Google Cloud Build documentation](https://cloud.google.com/build/docs/automating-builds/create-manage-triggers).
Author: LeetQuiz Editorial Team
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As a DevOps Engineer utilizing cloud-native tools for a CI/CD pipeline, you're tasked with automating builds using Cloud Build upon code pushes to Cloud Source Repositories. Which of the following actions cannot be used as a trigger with Cloud Source Repositories?
A
Push to a branch
B
Pull Request
C
Push new tag
D
Manual invocation