The Difference Between Mean and Median Is Which of the Following

The difference between mean and median is which of the following?

A) Mean is calculated by adding values, then dividing the sum by the number of values involved; median is calculated by putting the values into numerical order and finding the middle value.
B) Mean is a representation of the standard deviation within a study, and median is the value of the variance.
C) Median is calculated by adding values, then dividing the sum by the number of values involved; mean is calculated by putting the values into numerical order and finding the middle value.
D) Mean is the value of the variance within a study, and median is a representation of the standard deviation.