Peter works as a project manager for GOODSTEEL, a steel melting shop. He was assigned by his Executive Project Manager to study and prepare a report on the defects that eroded the blast furnace lining which has caused a drastic decline in production. Since this report will be used by the management to control the process and material quality, Peter performed a careful study and identified two major factors out of many factors related to refractories that caused majority of the lining problems. Which of the following statements BEST illustrate the technique Peter must have used in this scenario?
A. A Pareto chart indicates that the vital few sources of the problem.
B. A cause and effect diagram indicates how various causes show the history and variation of defects
C. A Pareto chart identifies the possible relationship between changes observed in two independent variables
D. A cause and effect diagram indicates how various factors or causes can be linked to potential problems