With reference to the scientific progress made in ancient India, which of the following statements are correct? 1. The use of different types of specialized surgical tools was common in the first century AD. 2. In the beginning of the third century AD, the transplantation of the internal organs of the human body had started. 3. The principle of sine of an angle was known in the fifth century AD. 4. Seventh century AD The principle of cyclic quadrilateral was known.

With reference to the scientific progress made in ancient India, which

1.	With reference to the scientific progress made in ancient India, which of the following statements are correct? 1. The use of different types of specialized surgical tools was common in the first century AD. 2. In the beginning of the third century AD, the transplantation of the internal organs of the human body had started. 3. The principle of sine of an angle was known in the fifth century AD. 4. Seventh century AD The principle of cyclic quadrilateral was known.
A.	1 and 2
B.	3 and 4
C.	1,3 and 4
D.	all these
Answer» D. all these