Which of the following statement(s) is/ are found to be incorrect? I. The core of Guru Nanak's teachings involve three fundamental doctrines: Nam, Shabad, Guru. II. Guru Nanak wanted his followers to eat together in a common kitchen called a Langar, without consideration of any caste or religion. III. In Sikh history, Guru Nanak's life is recorded in the Janam Sakhis, which record the various events of his life.