Evan and Eileen Carter are husband and wife and file a joint return for $2023.$ Both are under $65$ years of age. They provide all of the support of their daughter, Pamela $($age $25),$ who is a full$-$time medical student and earns no income. Evan and Eileen furnish all of the support of Belinda $($Evans grandmother$),$ who is age $80$ and lives in a nursing home. who is a friend of the family but does not live with them. How many dependents may the Carters claim?