Choice "a" is correct. The selection of an accounting method for tax purposes is made on the initial tax return by using the chosen method.

Choice "b" is incorrect. The selection of an accounting method for tax purposes is not made by filing a request for a private letter ruling from the IRS. A private letter ruling is a request for the IRS to rule in advance on a special set of facts.

Choice "c" is incorrect. The selection of an accounting method for tax purposes does not have to be first approved by the company's board of directors.

Choice "d" is incorrect. The selection of an accounting method for tax purposes does not have to be disclosed in the company's organizing documents.