The cumulative distribution function F (x) for a continuous random variable X is defined for every number x by which of the following inequalities? A. F (x) = P (X greaterthanorequalto x) B. F (x) = 1 - P (X lessthanorequalto x) C. F (x) = P (X lessthanorequalto x) D. F (x) = P (X greaterthanorequalto x) - P (X lessthanorequalto x)