Which of the following is also known as a dying star?

Supernova

The correct answer is Option (2) - Supernova

Supernovae are colossal explosions that occur when certain types of stars die. When a star, such as the Sun, dies, its outer layers are ejected into space, leaving its hot, dense core to cool over aeons. A supernova can have the same brightness as a galaxy of billions of "regular" stars.