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 $4,100 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 2016?

a. 2
b. 3
c. 4
d. 5
e. 6