The correct option is (a) Any arbitrary value
Easy explanation: After the selection of end points (A and B) and their tangent point C next step is to find point-S. When it is done the next step is to draw a line from a tangent point that can be at any arbitrary angle. This line could be at 20Β°, 50Β°, 60Β° or any arbitrary value as we desired. Once, this step is completed then, we can go further to find the next point of conic curve.