Sarah, a Six Sigma Black Belt, is leading a project to reduce defects in a manufacturing process. After analyzing data, she identifies a critical input variable that significantly impacts the defect rate. She wants to ensure this variable remains within specified limits during production. Which Six Sigma tool or technique should Sarah use to monitor and control this critical input variable? Question 12 options: Value Stream Mapping 5 Whys Analysis Control Chart Fishbone Diagram Brainstorming