If ABCD is a parallelogram and E, F the centroids of triangles ABD and BCD respectively, then EF equals
(a) AE
(b) BE
(c) CE
(d) DE
If ABCD is a parallelogram and E, F the centroids of triangles ABD and BCD respectively, then EF equals
(a) AE
(b) BE
(c) CE
(d) DE