GBP/USD rallies from daily low of 1.2707 to trade above the 1.2800 mark.Key resistance levels reclaimed: 50-DMA at 1.2787 and 1.2800 mark; next targets are 1.2860, 1.2900, and 1.2950.If GBP/USD falls below 1.2800, it may range between 1.2800 and 1.2700, with further support at 100-DMA (1.2683). The&