A discrete random variable X takes values from 1 to 5 with probabilities as shown in the table. A student calculates the mean of X and 3.5 and her teacher calculates the variance of X as 1.5. Which of the following statements is true?

• A. Both the student and the teacher are right
• B. Both the student and the teacher are wrong
• C. Both the student is wrong but the teacher is right
• D. The student is right but the teacher is wrong