All of the following statements are true regarding scatter diagrams?

A. Scatter diagrams illustrates a chart with upper and lower control limits on which values of some statistical measure for a series of samples are plotted B. Scatter diagrams illustrate the relationship between two variables C. Scatter diagrams use statistical measurement to identify the most important problems through different measurement scales, i.e. frequency, cost, etc, and directs attention and efforts to the most significant problems and/ or opportunities D. Scatter diagrams display the duration of a set of activities in a project's cycle