Which of the following is the best statement of the use of the addition rule of probability? O a. the probability that two or more independent events will both occur O b. the probability that one of two mutually exclusive events will occur Oc. the likelihood that a trait is due to two or more meiotic events O d. the probability that either one of two independent events will occur Oe. the probability that two or more independent events will both occur in the offspring of one set of parents