Marin is the manufacturing coordinator of a food and beverage company. Recently, some of the products were rejected by the quality control department because they failed to meet the quality standards. Upon inspection, a number of defects were found at multiple stages of production. Marin wants to identify the defects that have the most impact on the whole production process. In this case, which of the following quality control (QC) tools should she use? a. A histogram b. A cause-and-effect diagram c. A flowchart d. A Pareto diagram