Your quality assurance team has discovered several problems with the product of your project. They've rank-ordered the problems by frequency of occurrence on a chart and have determined that roughly 80 percent of the problems are occurring due to 20 percent of the causes they've identified. You know which of the following are true regarding this question? Each correct answer represents a complete solution. Choose all that apply. This type of question contains radio buttons and checkboxes for selection of options. Use Tab for navigation and Enter or space to select the option. A option A The 80/20 rule was first observed by Crosby. B option B You should spend the majority of your effort on causes that are generating 80 percent of the problems. C option C This type of chart is a Pareto chart. D option D Check sheets or tally sheets can be displayed using this type of chart