A month after signing the biggest e-commerce deal in the world, Walmart and Flipkart are facing roadblocks that could drastically change the contours of the transaction. If the Competition Commission of India (CCI) suggests structural changes in the Walmart-Flipkart deal, as indicated by officials, there could be three options before the American retail giant, sources said. One of the options for Walmart could be to not accept the structural changes suggested by the fair trade regulator, and back out of the deal. The second option could be to renegotiate the deal at a lower valuation. And the third could be