The correct answer is option 2, Indo-Greek. Gandhara art refers to a style of Buddhist art that developed in the Gandhara region (present-day Pakistan and Afghanistan) during the 1st century BCE to the 7th century CE. It is a unique combination of Indian and Greek artistic influences.

The region of Gandhara was a part of the Indo-Greek kingdom, which was established by the conquest of northwestern India by Alexander the Great and later ruled by Greek kings. The art produced in this region exhibits a fusion of Indian and Greek artistic traditions. The sculptures and reliefs of Gandhara art portray Buddhist themes but are executed in a style that incorporates Greek techniques such as naturalistic drapery, idealized anatomy, and frontal poses.

Therefore, Gandhara art is rightly considered as the combination of Indian and Greek artistic influences, making option 2 the correct answer.