Who abrogated the 1956 Constitution?

Who abrogated the 1956 Constitution?
A: Ayub Khan
B: Yahya Khan
C: Iskandar Mirza
D: None of these

President Iskandar (Iskander) Mirza imposed martial law in October 1958 and annulled the 1956 Constitution. Soon after; Ayub Khan assumed control. The episode ended Pakistan’s first parliamentary experiment.