The given question states that an Indian IT institute entered into a joint venture with Mitsubishi Corporation, a Japanese company, on April 21, 2014. The options provided are Infosys, Satyam Mahindra, Tata Consultancy Services (TCS), and HCL. Among these options, TCS is the correct answer as it is an Indian IT company and a subsidiary of Tata Group, which is known for its global presence and partnerships with various international companies. Therefore, Tata Consultancy Services (TCS) is the most suitable option for the given question.