Suppose the time a child spends waiting for the bus is exponentially distributed with mean 4 minutes. Choose the R code to determine the probability that the child should wait between 3 and 6 minutes for the bus on a given morning. (a) pgamma (6, 1, 4) - pgamma (3, 1, 4) (b) pgamma (6, 1, 1/4) - pgamma (3, 1, 1/4) (c) pgamma (6, 1, scale = 1/4) pgamma (3, 1, scale = 1/4) (d) pexp(6, 4) - pexp(3, 4) -

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