All types Ia supernovae: always involve a white dwarf, involve degenerate matter. option b,d
A supernova is a powerful, bright explosion of a star. It has the plural form Supernova or Supernova and is abbreviated as SN or SNe. This transient astronomical event occurs in the final stages of the evolution of massive stars, or when white dwarfs undergo runaway nuclear fusion.
Supernovae add rich elements to cosmic clouds of dust and gas, promote interstellar diversity, and create shock waves that compress gas clouds and support new star formation. However, very few stars become supernovae. Many stars cool down in their later years, ending their days as white dwarfs and later as black dwarfs.
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