Two lenses , One concave and the other convex of same power are placed such that their principal axes coincide. If the separation b/w the lenses is x, then ,

Question

a) real image is formed for x=0 only.

(b) real image is formed for all values of x

(c) System will behave like a glass plate for x=0

(d) virtual image is formed for all values of x other than zero.