What is the Centre of Curvature of a spherical mirror?

• A. It is the centre of a hollow sphere of which the spherical mirror is a part
• B. It is the midpoint of a spherical mirror
• C. It is the point on the principal axis through which rays of light parallel to the principal axis pass after reflection
• D. It is a point from which the rays of light appear to be coming from on the principal axis of a convex mirror