A carrier of tuberculosis has a 20% chance of passing the disease on to anyone with whom he comes into close contact who has had no prior exposure. During the course of a day, he comes into contact with 10 such individuals. Which event will be considered a success in this case?
a)A carrier of tuberculosis.
b)Person without previous exposure contracts the disease.
c)Exposure.
d)Contact with individuals.
e)None of the above.