An epidemic process is such that an infected individual is infectious for a time period which is exponentially distributed with rate parameter 3. While infectious, the individual gets into contact with susceptible individuals according to a Poisson process with rate parameter X. Let X be the number of susceptible individuals who get into contact with infected individual. The probability generating function of the distribution of X is Select one: O a. O b. 0 с. d. βλ B+A-As B B+A-As e-B(1-8) e -XB(1-8)

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