Consider the following statements about the treaty of Allahabad (1765):

 1. It was an agreement between the Mughal emperor Shah Alam II and the English East India Company

2. It made the English East India Company the Diwan of Bengal, Bihar and Orissa
3. As per the provisions of the treaty, the East India Company was granted Diwani in exchange for an annual tribute to Mughal Emperor
4. The treaty was worked out after the defeat of the Mughal emperor in the battle of Buxar

How many of the above statements is/are correct?

(a) 1
(b) 2
(c) 3
(d) 4