A student is studying a digital diagram of a fish. The diagram shows that the fish has a cartilaginous skeleton, a jaw, scales, and a backbone. Which fish is the student most likely studying?

o a skate because it has a cartilaginous skeleton and a jaw
o a salmon because it has scales and a backbone
o a ray because it has a jaw and a backbone
o a seahorse because it has a cartilaginous skeleton and scales