33. Which of the following statements is correct?

a. Estates unlike trusts, are not required to pay estimated income taxes.

b. Estates are not required to pay estimated income taxes on capital gain income.

c. Estates are not required to pay estimated income taxes in their first two years.

d. Estates are not required to pay estimated income taxes in their first two years if all income during the year consists of capital gain income and tax-exempt income.