I-N-D-I-A -- the Indian National Developmental Inclusive Alliance -- is what the united opposition front will be known as, 26 parties participating at the crucial meet in Bengaluru decided today, setting what Congress's Rahul Gandhi called a "Modi versus I.N.D.I.A" battle for the 2024 general elections. "We are defending the Constitution, voice of Indians and the idea of India. You know what happens to anyone who wants to fight the idea of India... The fight is between NDA and I.N.D.I.A, Narendra Modi and I.N.D.I.A, his ideology and I.N.D.I.A. India always wins all fights," said Mr Gandhi. "The fight is about two different ideas of India... The voice of the country is being stifled. The fight is for the voice of the country. So this name was chosen -- I.N.D.I.A," he added. Here are key challenges for the opposition alliance.