Which of the following statements is incorrect with respect to determining current E&P?
a. all tax-exempt income should be added back to taxable income.
b. Dividends received deductions should be added back to taxable income.
c. charitable contributions in excess of the 10% of taxable income limit should be subtracted from taxable income.
d. federal income tax refunds should be added back to taxable income.
e. none of the above statements are incorrect.