Accounting question on Matching Principle

ONECO gives a one-year warranty on all of its equipment. In January, a customer placed an order for a piece of equipment. The equipment was delivered and billed in February. The customer remitted half of the cash due in March and the other half in April. According to the matching principle of accounting, in which month should ONECO report estimated warranty expense related to the sale? Please explain how you got your answer.

 
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