Explanation:

• The Kushiyara River is a distributary river in Bangladesh and Assam, India. It forms on the India-Bangladesh border as a branch of the Barak River, when the Barak separates into the Kushiyara and Surma. The Kushiyara flows westward forming the boundary between Assam, India, and the Sylhet District of Bangladesh.
• At the India-Bangladesh Virtual Summit Bangladesh requested India to inform its border authorities to allow excavation work of the remaining portion of the Rahimpur Khal for utilization of Kushiyara River waters for irrigation purposes. India was also requested to provide early concurrence on the proposed MoU to be signed between the two countries for monitoring the withdrawal of water from the Kushiyara River by both the sides, pending signing of the Treaty/Agreement regarding sharing of water of the Kushiyara River.

Hence option 1st is correct.