The first four terms of a sequence are shown below: 9, 5, 1,-3
Which of the following functions best defines this sequence?
Of(1) = 9, f(n + 1) = f(n) = 4; for n 2 1
© f(1) = 9, f(n + 1) = f(n) + 4; for n = 1
O f(1) = 9, f(n + 1) = f(n) - 5; for n 2 1
Of(1) = 9, f(n + 1) = f(n) + 5, for n 2 1