Previously given answer was A. There are exactly two possible outcomes on each trial and they are mutually exclusive. was incorrect

Which assumption was not used to derive the binomial distribution function P (k(n, 0) = ex x (1 - 0) "-k2 O There are exactly two possible outcomes on each trial and they are mutually exclusive. O The order in which the trials are done does not matter. The success probability is unknown. O The outcome of each trial is independent of every other trial