Which of the Following Is Correct

Multiple Choice

Which of the following is correct?

A) A continuous random variable has a probability density function but not a cumulative distribution function.
B) A discrete random variable has a probability mass function but not a cumulative distribution function.
C) A continuous random variable has a probability mass function, and a discrete random variable has a probability density function.
D) A continuous random variable has a probability density function, and a discrete random variable has a probability mass function.