In Country C, some but not all eligible voters are required to vote. The particulars of the country's laws governing voting are as follows.

• Every citizen who is eligible must vote on election day.
• A person is eligible if (and only if) he or she meets the age requirement and either is a citizen or meets the residency requirement for noncitizens.
• The age requirement is that every voter must be at least 19 years old on election day.
• The residency requirement for noncitizens is that the voter must have been a resident of Country C for at least 5 years on election day.

Consider the following individuals:

Abigail: a citizen who is currently 19 years old

Barbara: a 7-year resident noncitizen who is currently 19 years old

Charles: a 7-year resident noncitizen who is currently 18 years old

For an election held today, select the individual or individuals who must vote, based on the information provided, and select the individual or individuals who must not vote, based on the information provided. Make only two selections, one in each column.­