Which famous leader has stepped down as leader of Kashmir group (Tehreek-e-Hurriyat)?

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Which famous leader has stepped down as leader of Kashmir group (Tehreek-e-Hurriyat)?

A. M.Ashraf Sehraie
B. Syed Ali Shah Geelani
C. M.Yasin Malik
D. Mirwaiz Umar Farooq