Which of the following was the first dinosaur with feathers?

Archaeopteryx, a species of bird-like dinosaur that lived approximately 150 million years ago during the Late Jurassic period, is thought to be the first dinosaur to have feathers. Archaeopteryx is thought to be one of the first and most primitive birds, as well as a transitional form between non-avian dinosaurs and birds.

Theropods were a group of dinosaurs that included carnivorous dinosaurs like Tyrannosaurus rex, but not all theropods had feathers.

Sauropods were a group of dinosaurs that included some of the largest land animals ever known to exist, but they did not have feathers.

Stegosaurs were a type of dinosaur known for their bony plates and spines, but they were not known to have feathers.