The correct option is (c).
Explanation
A plane mirror forms an image through the reflection of light. The image formed is always virtual, erect, and laterally inverted. The characteristics of the image are strictly governed by the laws of reflection.Statement 1 is Incorrect: The image formed by a plane mirror undergoes lateral inversion, meaning the left side of the object appears as the right side of the image and vice versa. It is not vertically inverted (upside down). Vertical inversion is a characteristic of real images formed by concave mirrors or convex lenses under specific conditions.
Statement 2 is Correct: The image formed by a plane mirror is of the same size as the object. The magnification ($m$) produced by a plane mirror is always $+1$.
Statement 3 is Correct: The image appears to be formed at the same distance behind the mirror as the object is placed in front of it. The line joining a point on the object and its corresponding point on the image is perpendicular to the mirror surface.
Key Takeaway: Images formed by plane mirrors are virtual, erect, laterally inverted, equal in size to the object, and equidistant from the mirror surface.