Ariel Tax Planning Service has the following plant​ assets: Communications​ equipment: Cost, with useful life of 8​ years; Furniture:​ Cost, with useful life of 12​ years; and​ Computer: Cost, with useful life of 4 years. Assume the residual value of all the assets is zero and the straightline method is used. ​Ariel's monthly depreciation journal entry will include a​ ________.

a. credit to Accumulated Depreciation of $481
b. credit to Depreciation Expense of $5,772
c. debit to Accumulated Depreciation of $481
d. debit to Depreciation Expense of $5,772