Let X be a random variable, which has a binomial distribution with a mean of μ = 8 and a standard deviation of σ = 2.19. The parameters n and p for this binomial distribution are, respectively,
A. n = 13.3 and p = 0.6.
B. n = 20 and p = 0.6.
C. n = 10 and p = 0.8.
D. n = 16 and p = 0.5.
E. n = 20 and p = 0.4.