Which of the following statements are false?

Which of the following statements are false?
 a. Decision-making includes optimization techniques for problems with certainty, decision analysis for problems with certainty, and structured sensitivity analysis.
  b. Graphical models can be very helpful for simple problems. For complex problems, however, graphical models usually fail to show the important elements of a problem and how they are related.
  c. Dealing with uncertainty includes measuring uncertainty and modeling uncertainty explicitly into the analysis.
  d. All of these statements are false.