Answer the questions...no need detail explanation

Question 1

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.Which of the following is not a characteristic of a probability density function f (x) ? A. f (x) 2 0 for all values of x. B. f (x) is symmetric around the mean. C. The area under f (x ) over all values of x equals one. D. f(x) becomes zero or approaches zero if x increases to + co or decreases to -co