Which of the Following Statements Is True of Voting Requirements

Which of the following statements is true of voting requirements for voters in the United States ?

A) All voters should be twenty-one years of age.
B) Voters should be citizens of the United States.
C) Voters should abide by a residency requirement of at least sixty days.
D) Noncitizens need to take the president's permission to cast their vote.
E) To be exempted from voting, a voter needs to produce a medical certificate.