The festival Baisakhi or Vaisakhi is commemorates which among the following important event of Sikh History?
[A]Establishment of Akal Takht
[B]Establishment of Khalasa Panth
[C]Establishment of Guru Granth Sahib as permanent guru of Sikhs
[D]Foundation of Harmandir Sahib (Golden Temple) in Amritsar

Establishment of Khalasa Panth