question_answer

If \[\mathbf{4a}\mathbf{.}{{\mathbf{b}}^{\mathbf{5log}}}{{_{\mathbf{b}}}^{\mathbf{a}}}\mathbf{=2916}\]then the value of a is _________

A)             1                                                         

B) 0           

C) 2                                                         

D) 3

E) None of these