An Estimator $\hat { \mu } _ { Y }$ Of the Population Value

Multiple Choice

An estimator $\hat { \mu } _ { Y }$ of the population value $\mu _ { Y }$ is consistent if

A) $\hat { \mu } _ { Y } \stackrel { p } { \rightarrow } \mu _ { Y } .$
B) its mean square error is the smallest possible.
C) Y is normally distributed.
D) $\bar { Y } \stackrel { p } { \rightarrow } 0$