Benchmark indices, such as the BSE Sensex and NSE Nifty50, closed lower on the first trading session of the week, weighed down by broad-based selling. The Sensex declined by 548.39 points (0.70%) to settle at 77,311.80 after fluctuating between an intraday high of 77,849.58 and a low of 77,106.89. Similarly, the NSE Nifty50 fell 178.35 …