A Lens of 12

A lens of 12.0-cm focal length is placed 20 cm to the right of the object and a mirror of focal length -20.0 cm is placed 50.0 cm to the right of the lens.Where is the image formed by the mirror?

A) 40.0 cm to the right of the mirror
B) 5.00 cm to the left of the mirror
C) 17.1 cm to the left of the lens
D) 10.0 cm to the right of the mirror