The festival Baisakhi or Vaisakhi is commemorates which among the following important event of Sikh History?

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
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