Given the 3x2 python array below, use broadcasting for the following procdures:

arr = np.array([[3, 7], [6, 2], [1, 4]])

a. Normalize each column by subtracting the column mean from every column entry and dividing the difference by the column standard deviation. Return the result.

b. Repeat the above but for the rows. Operate directly on arr as given and use broadcasting.