On April 1, 2017, Ayayai Corp. paid $ 45100 cash for equipment that will be used in business operations. The equipment will be used for four years. Ayayai's records depreciation expense of $ 45100 for the calendar year ending December 31, 2017. Which accounting principle has been violated?

A. Cash principle.

B. No principle has been violated.

C. Depreciation principle.

D. Expense recognition principle.