What is the content of x when the following Python program executes? a - tuple("banana") x = {} for c in a: x[c] = x.get (c, 0) + 1 O {'b': 1, 'a': 1, 'n': 1, 'a': 1, 'n': 1, 'a': 1} O {'b': 1, 'a': 3, 'n': 2} O {a': 3, 'b': 1, 'n': 2} O {'b':0, 'a': 1, 'n': 2}

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