Given five points on a circle of radius 4 units.The centres of rectangular hyperbolas passing through these points taken four at a time, are laying on the fixed curve S,then
Choose the correct option:
A. ecentricity of S is 1/2
B. ecentricity of S is √2
C. any pair of prependicular tangents of the curve S meet on a line
D. area of S is 4π