What is the method used to calculate the recent historical sales of iPhones at the local Apple store?
A) Weighted moving average with weights of .62 one period ago, .23 two periods ago, and .15 three periods ago
B) Simple moving average with weights of .62 one period ago, .23 two periods ago, and .15 three periods ago
C) Exponential moving average with weights of .62 one period ago, .23 two periods ago, and .15 three periods ago
D) Weighted moving average with weights of .62 three periods ago, .23 two periods ago, and .15 one period ago