Point A (0, 1 cm) and B (12 cm, 5 cm) are the coordinates of object and image. x-axis is the principal axis of the mirror. Then, this object image pair is
a. due to a convex mirror of focal length 2.5 cm
b. due to a concave mirror having its pole at (2 cm, 0)
c. due to a concave mirror having its pole at (-2 cm, 0)
d. Data is insufficient