Which formula defines the sequence f(1) = 2, f(2) = 6, f(3) = 10, f(4) = 14, f(5) = 18? O f(1) = 2, f(n) = 4+ f(n-1) for n 2 Of(1) = 2, f(n) = 6+ f(n - 1) for n 2 O f(1) = 6, f(n) = 4+ f(n-1) for n 2 Of(1) = 2, f(n) = 2+ f(n - 1) for n 2