A group of students is arranging squares into layers to create a project. The first layer has 5 squares. The second layer has 10 squares. Which formula represents an arithmetic explicit formula to determine the number of squares in each layer? f(1) = 5; f(n) = 5 ⋅ d(n − 1), n > 0 f(1) = 5; f(n) = 5 ⋅ d(n + 1), n > 0 f(1) = 5; f(n) = 5 + d(n − 1), n > 0 f(1) = 5; f(n) = 5 + d(n + 1), n > 0