Suppose a recent survey of chicken meat resulted in the following test results: 81% were contaminated with campylobacter, 15% were contaminated with salmonella, and 13% were contaminated with both of these bacteria. What is the probability that a tested chicken chosen at random is:
a. contaminated with salmonella and not campylobacter
b. contaminated with salmonella or compylobacter
c. contaminated with salmonella or campylobacter but not both
d. not contaminated with either salmonella or campylobacter
e. contaminated with salmonella given that the chick is known to be contaminated with campylobacter