Which of the Following Versions of the Polio Vaccine Is

Which of the following versions of the polio vaccine is preferred in the United States?

A) inactivated polio vaccine which is injected into muscle and requires several boosters
B) oral polio vaccine which is made up of an attenuated viral strain
C) antibiotic treatment to clear the infection
D) transgenic DNA vaccine, which is made by inserting DNA for polio capsid proteins into the genome of a nonvirulent virus
E) Currently no vaccine is available, and patient isolation is the preferred method of control.