Explanation:

The correct option is (a) Shakti. Project Shakti is a pioneering initiative by IIT Madras aimed at designing and fabricating India's first indigenous microprocessor. The first chip developed under this project, based on the open-source RISC-V architecture, was named 'Shakti'. This marked a significant step towards self-reliance in semiconductor design. Options (b) Speed, (c) Atal, and (d) Bharat are not the names of the microprocessor developed by IIT Madras. 'Speed' is a general term, 'Atal' refers to a former Prime Minister, and 'Bharat' is the name for India; none of these are specific microprocessor names from IIT Madras.