What is the difference between asteroids and comets ? I. Asteroids are small rocky planetoids, while comets are formed of frozen gases held together by rocky and metallic material. II. Asteroids are found mostly between the orbits of Jupiter and Mars, while comets are found mostly between Venus and Mercury. III. Comets show a perceptible glowing tail, while asteroids do not. Which of the following statements given above is/are correct?