A requisition for the surrender of a fugitive criminal of a foreign State 4* * * may be made to the Central Government―
(a)by a diplomatic representative of the foreign State 4* * * at Delhi; or
(b)by the Government of that foreign State 4* * * communicating with the Central Government through its diplomatic representative in that State 5***;
and if neither of these modes is convenient, the requisition shall be made in such other mode as is settled by arrangement made by the Government of the foreign State 4* * * with the Government of India.