Choose the correct statement below. A. Estimators do not generate statistics that provide estimates of unknown population parameters. B. 1nXi is an estimator for and 1n(XiX)2 is an unbiased estimator for 2. C. 1nXi is an estimator for and 1nXi=0 is an estimate for E(X). D. 1nXi is an estimator for E(X) and 1n1(XiX)2 is an unbiased estimator for E[(XE(X)2]. E. 1nXi is an estimator for and 1n(XiX)2 is an unbiased estimator.