Which One of the Following Statements Is the Most Accurate

Which one of the following statements is the most accurate?

A) An International Certificate of Vaccination is required for travel to Canada.
B) For travel to many countries, an International Certificate of Vaccination is not required.
C) If the traveler needs an immunization certificate, he or she can obtain it from the local health department or the traveler's personal physician.
D) The immunization may be given by the local health clinic and the certificate may be stamped by the traveler's personal physician after the vaccination is administered.