C-09-Q091mediumsingle_mcqThe base-change formula states logaM\log_a MlogaM equals:alogbM⋅logab\log_b M \cdot \log_a blogbM⋅logabblogbM+logab\log_b M + \log_a blogbM+logabclogbMlogba\dfrac{\log_b M}{\log_b a}logbalogbM as welldboth a and c