A group of students is arranging squares into layers to create a project. The first layer has 4 squares. The second layer has 8 squares. Which formula represents ab arithmetic explicit formula to determine the number of squares in each layer? A. F(1) = 4; f(n) = 4 x d(n - 1), n > 0

B. F(1) = 4; f(n) = 4 x d(n + 1), n > 0

C. F(1) = 4; f(n) = 4 + d(n + 1), n = 0

D. F(1) = 4; f(n) = 4 + d(n - 1), n > 0​