An asset has an average return of 5 percent and a standard deviation of 10 percent. Which of the following statements is true?
a. its variance is 25,
b. its coefficient of variation is 2.0
c. if returns are normally distributed, 95 percent of the time its returns will fall between -5 percent and 15 percent
d. if returns are normally distributed, 99 percent of the time its returns will fall between -15 percent and 25 percent.