Bob and Donna have been married for 35 years and have filed joint returns since their marriage. The couple has three children: Jack (age 11), Bonnie (age 16), and Margie (age 22). All three children live with Bob and Donna. In addition, none of the children provide more than half of their own support. Margie is a full-time student at a local university and does not have any gross income.

Based on the situation above, answer the following question

a. How many personal exemptions can Bob and Donna claim?