Ancient and Medieval Indian Rulers

 Option (4) is correct.

Mihir Bhoja is widely recognized as a major ruler of the Gurjara-Pratihara dynasty, though Nagabhata I is often credited as the founder. Given the options, Mihir Bhoja is the most prominent historical figure listed associated with the empire's peak.

Harshavardhan moved his capital from Thaneshwar to Kannauj to better manage his expanding empire in Northern India.

Emperor Ashoka is famous for his extensive use of rock and pillar edicts to propagate his policy of Dhamma throughout his empire.

Ashoka's inscriptions in the Kharoshti script were primarily found in the northwestern regions of his empire, specifically at Shahbazgarhi and Mansehra, but Qandahar is also a site where his bilingual (Greek and Aramaic) inscriptions were found.

The Chalukyas were associated with Badami, Vengi, and Kalyani. Kanchi was the capital of their rivals, the Pallavas.

Chanakya (also known as Kautilya) was the mentor and strategist who helped Chandragupta Maurya overthrow the Nanda dynasty and establish the Mauryan Empire.

Greek historians referred to Chandragupta Maurya as Sandrocottus or Androcottus in their accounts of the Indian subcontinent.

Option (4) is correct.

Aryabhatta, the great Indian mathematician and astronomer, lived during the Gupta period. He is widely believed to have flourished during the reign of Chandragupta II, also known as Chandragupta Vikramaditya.

In ancient times, the region of Bengal was historically referred to as Gauda or Vanga.

Tipu Sultan, known as the Tiger of Mysore, was the ruler of the Kingdom of Mysore in southern India.

The Satavahana dynasty emerged in the 1st century BCE, predating the rise of the Guptas (3rd century CE), Palas (8th century CE), and the later Cholas.