The image of a coin you see during a lens is on the object side and is upright, the signs of image distance and magnification are
1. The signs of image distance and magnification are both negative.
2. The signs of image distance and magnification are both positive.
3. The sign of image distance is positive and the sign of the magnification is negative.
4. The sign of image distance is negative and the sign of the magnification is positive.