Which of the following proportions is correct if ba is tangent to the circle, ?

a. ac/ad = ab/bc
b. ab/bc = bd/ab
c. ab/ab = bd/bc
d. bc/bd = ab/bc

I think you forgot to attach the image along with the question. "AB/BC = BD/AB" is the one among the following choices given in the question that is correct if BA is tangent to the circle. The correct option among all the options that are given in the question is the second option or option "B". I hope it helps you.