An Unbiased Estimator Is

An unbiased estimator is:

A) any sample statistic used to approximate a population parameter.
B) a sample statistic,which has an expected value equal to the value of the population parameter.
C) a sample statistic,which is usually less than the population parameter.
D) represented by a sample mean,the sample proportion,the sample variance,and the sample standard deviation.
E) any standard error of the mean or standard error of the proportion.