Construct the described data set with the mean and median being the same and the data set being bimodal.
A. {1, 2, 3, 4, 5, 6}
B. {2, 2, 4, 4, 6, 6}
C. {1, 2, 3, 3, 4, 5}
D. {1, 1, 2, 3, 3, 4, 4, 5, 5}