Your question is Regression vs Sanity Test Strategy. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You are reviewing test strategy for a software release and want to make sure the team is using the right level of validation after code changes. You need to explain the difference between broader confidence-building test passes and narrower checks used to confirm a specific fix or build is stable enough to continue.
Explain the difference between regression testing and sanity testing, and when you would use each.