All the students of a class performed poorly in Mathematics. The teacher decided to give grace marks of $10$ to each of the students. Which of the following statistical measures will not change even after the grace marks were given?

Adding a constant to every value in a dataset is a "change of origin."Mean, Median, and Mode all increase by that constant.Measures of dispersion (Range, Mean Deviation, Standard Deviation, Variance) are independent of the change of origin.Therefore, the variance remains unchanged.