Option a is the correct answer. Krishnadevaraya fought the Battle of Golconda through his Prime Minister Timmarusu in 1531 against Quli Qutb Shah, the founder of the Qutb Shahi dynasty of Golconda. The battle was a victory for Krishnadevaraya, and it helped to consolidate the power of the Vijayanagara Empire in the Deccan.