[Q11] The matrix median problem

What can we be sure about the matrix median approximations M(M_x ;A, B, C)?

1. It will never be lower than the real median score.
2. It will never be lower than 3/4 of the real median score.
3. It will never be higher than 4/3 of the real median score.
4. It will never be higher than the real median score.
5. None of the above.

Original idea by: Juan Felipe Hernández Albarracín.