Margaret, age 65, and John, age 62, are married with a 23-year-old daughter who lives in their home. They provide over half of their daughter’s support, and their daughter earned $3,900 this year from a part-time job. Their daughter is not a full-time student. How many exemptions should Margaret and John claim on a joint return for 2010?

a. 3

b. 4

c. 2

d. 6

e. 5