Barbara places an object in front of a mirror. The mirror produces an image that is inverted, real, and smaller than the object.

Which kind(s) of mirror could Barbara be using?

convex, because concave and plane mirrors produce only virtual images
concave, because plane and convex mirrors produce only upright virtual images
concave or convex, because both types of mirrors produce images that are inverted and real
convex or plane, because both types of mirrors produce an image that is smaller than the object