Big four of thrash metal

Who are the Big four of thrash?

• Metallica, Sonata Arctica, Death, Necrophagia
• Avenged Sevenfold, Helloween, Dragonfoce, Hells Hammer
• Kiss, Twisted sister, Megadeth, Anthrax
• Pantera, Aerosmith, Dream theatre, Slayer
• Slayer, anthrax, Metallica, Necrophagia
• Megadeth, Dream theatre, Pantera, Led zeppelin
• Anthrax, Megadeth, Metallica, Slayer
• Avenged Sevenfold, Static-X, Alice Cooper, Black sabbath