Which of the following art forms of Kerala is in UNESCO’s list of the Intangible Cultural Heritage of Humanity?

Which of the following art forms of Kerala is in UNESCO’s list of the Intangible Cultural Heritage of Humanity? [SSC CHSL (10 + 2) Exam 01/07/2019, Shift III]

          a) Theyyan

          b) Kutiyattam

          c) Chakyar Koothu

          d) Thiruvathirakali