This is not a real exam question. Indeed, the exam isn't even real! This is just for fun!
What are two (2) advantages of a delta deployment instead of deploying the entire contents of a git repo?
- You can only run the tests you need, thus reducing deployment time
- A smaller deployment package makes deployment easier to reason about
- Deploy only what's needed and avoid deploying metadata that isn't deployable because it's org-specific
- Avoid hitting the deployment size limit
As with any Salesforce certification, the answer is almost always "it depends," and there's no clear-cut answer.
In this particular scenario: