Determine whether each of the following transactions is a preference (P), is an adjustment (A), or is not applicable (NA) for purposes of the corporate AMT.
a. Depletion in excess of basis taken by Giant Oil Company.
b. Accelerated depreciation on property.
c. Charitable contributions of cash.
d. Adjusted current earnings.
e. Untaxed appreciation on property donated to charity.
f. Dividends received deduction.