The 3 x 4 x 5 array a is filled with numeric values. The R command > b = a[c(1, 3), -C(1, 4), 3:5) sets b to a 2 x 2 x 3 array that includes the first and third rows, excludes the first and fourth columns, and includes the third, fourth, and fifth layers of a. Write an R command that accomplishes this same operation using the smallest number of keystrokes