Randy is single and has no qualifying child. His AGI is $13,335. In order to claim the Earned Income Tax Credit, he must meet which of the following requirements?
a. He cannot be the dependent of another taxpayer.
b. He may have either an ITIN or a Social Security Number.
c. He must be 21 or older.
d. He must earn his income as an employee.
e. He cannot be self-employed.