Which of the Following Is the Best Description of a Robust

Which of the following is the best description of a robust estimator?

A) It is one that is unbiased and symmetrical about 0.
B) It is one that is consistent and also mound-shaped.
C) It is one that is efficient and less spread out.
D) It is one that is not sensitive to a moderate departure from the assumption of normality in the population.