Consider the following statements about Ammonite
1- A large and diverse group of creatures that arose during the Devonian period, which began about 416 million years ago.
2- Ammonoids are related to other cephalopods—such as squid, octopuses, and cuttlefish—and they were early relatives of the modern nautilus.
3- Ammonite shells are used today as index fossils, meaning they can help date other fossils that are found in the same layer of marine rock.
Which of the following given above is/are correct