The concave mirror produces a real image in almost all cases except one.
Thus option 1 is not a correct answer.
When the object is farther away than the focal point, a real and diminished object is formed. Thus option 2 is not a correct answer either.
When the object is placed farther away from the radius of curvature, a real and diminished image is formed. Thus option 3 is not a correct answer.
When the object is placed between the focal point and the mirror, the image produced will be virtual and enlarged.
Thus the correct answer is option 4.
