Most ABO antibodies are

If a CPT code stated on a claim form represents a lower level of service than is documented in the medical record, the procedure has been downcoded

Indicate whether this statement is true or false.

Immunological memory produced by vaccination:

a. Is the long-term persistence of protection due to the presence of memory B-cells b. Is not always detectable by serological testing c. Provides a strong and rapid response following re-exposure to the specific antigen d. All of the above