Option a is the correct answer. Chakiarkoothu is a traditional dance form of Kerala that is performed in the temples. It is a highly refined monologue where the performer narrates episodes from Hindu epics like Ramayana and Mahabharata. It was originally performed only in Koothambalams of Hindu temples. Statement 1 is correct: It is performed by members of the Chakiar caste along with the Ambalavasi Nambiars. Statement 2 is incorrect: Chakiarkoothu can be traditionally witnessed by the higher caste Hindus, but not by the lower caste Hindus or non-Hindus. Statement 3 is correct: Mizhavu is the accompanying instrument. Mizhavu is a big copper drum that is played as an accompanying percussion instrument in the Koodiyattam and Koothu, performing arts of Kerala. Statement 4 is correct: Koothambalam is the name of the theatre form where Chakiarkoothu is performed.