Costco Wholesale Corporation Collects Annual Non-Refundable Membership Fees from Customers

Costco Wholesale Corporation collects annual non-refundable membership fees from customers. When should Costco recognize revenue for these membership fees?

A) Immediately when cash is received because the fees are nonrefundable
B) Evenly over the membership year
C) Evenly over the current fiscal year
D) At the end of the membership year when Costco has discharged its obligation to the customer
E) Pro rata over the customer's actual purchasing pattern