The question asks us to identify the first Indian IT company to reach a market capitalization of $100 billion. Let's go through each of the options to determine the correct answer:
Upon evaluating all the options, it is clear that TCS is the correct answer. TCS's achievement marks a significant event in the Indian IT sector, highlighting the growth and potential of Indian companies in the global market.
Therefore, the first Indian IT company to reach a $100 billion market capitalization is TCS.