Which kingdom/empire was referred to as 'Karnataka Samrajyamu' by the contemporaries?

Vijayanagara Empire

The correct answer is Option (2) → Vijayanagara Empire

The term "Karnataka Samrajyamu" was used by contemporaries for the Vijayanagara Empire.

The Vijayanagara Empire was founded by the Harihara, also known as Hakka, and his brother Bukka Raya, who were Kannada speakers. The empire's capital, Hampi, was also located in Karnataka. As a result, the contemporaries referred to the empire as the Karnataka Samrajyamu, or the Karnataka Empire while historians use the term Vijaynagara Empire.