Leander Paes and Mahesh Bhupati won the two doubles grand slam titles in 1999, these were

Paes and Bhupati were also the runners-up at the 1999 French Open and the 2001 US Open. They were inducted into the International Tennis Hall of Fame in 2015.

Here is a brief explanation of each option:

• Option A: Australian and French Open. This is incorrect because Paes and Bhupati did not win a Grand Slam doubles title at the French Open in 1999.
• Option B: French Open and Wimbledon. This is incorrect because Paes and Bhupati did not win a Grand Slam doubles title at the French Open in 1999.
• Option C: Wimbledon and Australian Open. This is the correct answer because Paes and Bhupati won the men’s doubles title at the 1999 Wimbledon Championships and the 1999 Australian Open.
• Option D: US Open and French Open. This is incorrect because Paes and Bhupati did not win a Grand Slam doubles title at the US Open in 1999.