The Python code below is made to calculate the population standard deviation of x. Choose the best answer to enable the code to function properly. import math x = [5, 7, 2, 12, 8, 3] mean = 6.1667 result = 0.0 for i in x: result = result + (i - mean) ** 2 stddev = math.sqrt( _____ ) print("Standard deviation =", stddev) Option A result / len(x) - 1 Option B result / len(x) Option C mean / len(x) Option D mean / len(x) - 1