Which of the following is/are correct about a tetrahedron?

Options

A. (a) Centroid of a tetrahedron lies on lines joining any vertex to the center of opposite faces.
B. (b) Centroid of the a tetrahedron lies on lines joining the mid point of the opposite faces.
C. (c) Distance of centroid from all the vertices are equal.
D. (d) None of these

Answer

(a, b)