Multiple choice question please choose the right answer

9. Canadian Blood Services tests blood donations for West Nile Virus according to the following protocol. Samples from units of blood are pooled, six units at a time, and the pool of six is tested for the presence of West Nile Virus. If any unit comes from a donor with West Nile Virus, the pool tests positive. A blood drive is being held in a particular town. Suppose the actual prevalence of West Nile Virus in the town is 1 in 500. Assuming independence between donors, find the probability that a randomly selected pool of six units test positive.

(A) 0.00200 (B) 0.01194 (C) 0.98806 (D) 0.01188 (E) 0.01200

(please explain the steps of how you got to the answer)