The student learns the Medicare guidelines for preventive health and reimbursement policies. Which statements follow the guidelines? (Select all that apply.)

a. Medicare pays for an annual pneumococcal vaccination.
b. Medicare covers annual influenza vaccinations.
c. Pap smears and pelvic exams are covered once every 2 years.
d. Annual fecal occult blood tests are covered for those who are older than 50
e. A bone density scan is covered every 2 years (a copayment is required).