Regarding Shaivism sect, choose the correct statement.
$$1.$$ Philosophy of Shaivism in Rigveda is explained in form of Rudra.
$$2.$$ Seal of Pashupati obtained from Indus Valley civilisation is earliest evidence of Shaivism.
$$3.$$ Rashtrakuta King Krishna - $$1$$ built famous Kailasha temple in Ellora.
$$4.$$ During Pallava dynasty, Nayanars were very instrumental in spread of Shaivism.
Correct option is D. All of these