Option 1: Saluva Narasimha. This option is incorrect because Saluva Narasimha was not the ruler of the Vijayanagara empire during the time of Babur`s invasion. He was a prominent minister and commander under the previous ruler, and later became the regent after the death of the king.

Option 2: Devaraya II. This option is also incorrect. Devaraya II ruled the Vijayanagara empire from 1422 to 1446, which was before Babur`s invasion in the 16th century.

Option 3: Krishna Deva Raya. This is the correct answer. Krishna Deva Raya, also known as Krishna Devaraya, was the ruler of the Vijayanagara empire during the time of Babur`s invasion. He ruled from 1509 to 1529 and was one of the most celebrated kings in South Indian history. Under his rule, the empire reached its peak in terms of political and military power, as well as cultural and artistic achievements.

Option 4: Sadasiva Raya. This option is incorrect. Sadasiva Raya was the last ruler of the Vijayanagara empire, and he ascended to the throne several years after Babur`s