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Given the following trading activities, what is the open interest at the end of day 3 (Hint: one long contract and one short contract are considered as one open interest)? Actions Time Open Interest t=0 0 Trading will open for gold contracts tomorrow Trader A buys 2 and trader B sells 2 gold contracts t = 1 2 Trader C sells 1 and trader D buys 1 gold contract t=2 3 t=3 ? Trader E sells 2 and trader C buys 2 gold contracts 1. 2 2.3 3.4 4.5 5.6