Which of the following malignancy is a variant of Giant cell tumor?

"A chondroblastoma is a rare, usually benign, tumor of bone that accounts for approximately 1% of all bone tumor. In 1931, Codman classified it as a chondromatous variant of giant cell tumors, when he described these lesions in proximal humerus. A decade later, Jaffe and Lichtenstein renamed the Codman tumor a benign chondroblastoma emphasizng the chondroblastic genesis of the lesion and to distinguish it from the classic giant cell tumor of bone.