He is a Mathematician and astronomer of the 12th century.His name is associated with India's third satellite?

To solve this question, the user needs to know about the famous mathematicians and astronomers of the 12th century and their contributions to the field of mathematics and astronomy.

Now, let's go through each option and explain why it is right or wrong:

A. Bhaskara-II: This option is correct. Bhaskara-II was a well-known Indian mathematician and astronomer who lived in the 12th century. He made significant contributions to algebra, trigonometry, and calculus. In addition, he designed India's third satellite, which was named after him.

B. Aryabhatta: This option is incorrect. Aryabhatta was a famous Indian mathematician and astronomer who lived in the 5th century. He made significant contributions to the fields of mathematics and astronomy, including the invention of the digit zero. However, he was not associated with India's third satellite.

C. Bhaskara-I: This option is incorrect. Bhaskara-I was also an Indian mathematician and astronomer who lived in the 7th century. He made significant contributions to the field of astronomy, including the discovery of the principles of cyclic astronomical phenomena. However, he was not associated with India's third satellite.

D. All the above: This option is incorrect because only option A, Bhaskara-II, is the correct answer.

Therefore, the answer is: A. Bhaskara-II.