Roger is the sole beneficiary of a trust created by his father. Over the past 3 years, income was distributed annually, as well as $5,000; $2,000; and $1,000 of principal, respectively. The trust provides no charitable contributions. In the current year, no amount of principal was distributed. How is this trust classified in the current year?

a. Grantor.

b. Simple.

c. Revocable.

d. Complex.