Among the following Presidents of India, who was also the Secretary General of Non-Aligned Movement for some period ?

1. The Non-Aligned Movement (NAM) is a forum of developing world states that are not formally aligned with or against any major power bloc. 2. The position of Secretary General of Non-Aligned Movement is held by the head of state or government of the country hosting the NAM Summit. 3. India hosted the 7th NAM Summit in New Delhi in 1983. 4. At that time, Giani Zail Singh was the President of India (1982-1987). 5. Therefore, Giani Zail Singh served as the Secretary General of Non-Aligned Movement during India's chairmanship.