A. {0} B. {2} C. {0,2} D. (0,2) E. {(0,2)} The solution set of the equation 9x2+1=0 is A. {1/3} B. {-1/3} C. {1/3, -1/3} D.∅ E. None of them The solution set of x2-6x+5=4 is A. {(1,5)} B. {2√3+3} C. {3±2√3}