Which of the following represents a difference between continuous and discrete random variables?

A) Continuous random variables assume an uncountable number of values,and discrete random variables do not.
B) The probability for any individual value of a continuous random variable is zero,but for discrete random variables it is not.
C) Probability for continuous random variables means finding the area under a curve,while for discrete random variables it means summing individual probabilities.
D) All of these choices are true.