Which of the Following Statements Is (Are) True

Short Answer

Which of the following statements is (are) true? $\begin{array}{|l|l|}\hline A&\text { The sample mean is relatively more efficient than the sample median. }\\\hline B&\text { The sample median is relatively more efficient than the sample mean.}\\\hline C&\text { The sample variance is relatively more efficient than the sample variance.}\\\hline D&\text {All of these choices are correct. }\\\hline \end{array}$