Correct Answer:
C. Chairperson
The notice period for a special meeting of the Board can be reduced at the discretion of the Chairperson. As the presiding officer, the Chairperson holds the authority to manage the Board's meeting logistics, including adjusting notice periods for special circumstances. This flexibility allows the Board to convene urgently when critical matters arise, ensuring swift decision-making. The Secretary handles administrative tasks, members collectively make decisions but not unilaterally on notice periods, and the Director General is an executive role separate from the Board's procedural authority.