11. (04.06 lc) the first four terms of a sequence are shown below: 9, 5, 1, −3 which of the following functions best defines this sequence? (5 points) f(1) = 9, f(n + 1) = f(n) − 4; for n ≥ 1 f(1) = 9, f(n + 1) = f(n) + 4; for n ≥ 1 f(1) = 9, f(n + 1) = f(n) − 5; for n ≥ 1 f(1) = 9, f(n + 1) = f(n) + 5; for n ≥ 1