Mr. and Mrs. D file a joint return for the current year. Mr. D is 67 years old, and Mrs. D is 52 years old. They provide 80% of the support for their son, Tom. Tom is 17 years old, is single, and had wages of $4,200 in the year. On their respective tax returns for the current year, Mr. and Mrs. D and their son, Tom, should claim which of the following number of personal exemptions?