Which statements are correct regarding centriole?
| I: | Centrioles are typically made up of nine sets of short microtubule triplets, arranged in a cylinder. |
| II: | The main function of centrioles is to produce cilia during interphase and the aster and the spindle during cell division. |
| III: | Centrioles start duplicating when DNA replicates. |
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II and III |