No matter how far you stand from a mirror, if your image appears erect, the mirror is likely to be either a plane mirror or a convex mirror.

Explanation:

• A plane mirror always produces a virtual, erect image regardless of the distance of the object from the mirror. The image is of the same size as the object.
• A convex mirror also always produces a virtual, erect, and diminished image irrespective of the object's distance from the mirror.
• A concave mirror can produce either erect or inverted images depending on the position of the object relative to the mirror’s focal point, so it does not always produce an erect image.

Thus, the mirror is likely to be either plane or convex if the image is always erect regardless of how far you stand from it.