Which of these statements correctly describe the images formed by an object placed before a single thin lens?
1. Real images are always enlarged.
2. Real images are always inverted.
3. Virtual images are always upright.
4. Converging lenses never produce virtual images.
(a) 1 and 3
(b) 2 and 3
(c) 2 and 4
(d) 2, 3, and 4
(e) 1, 2, and 3
(f) 4 only