A 40-year-old woman presents for her annual physical exam. She reports feeling generally well but expresses concerns about occasional hot flashes, night sweats, and difficulty sleeping. She also mentions noticing some changes in her mood, such as increased irritability and anxiety. On physical examination, her vital signs are stable. A pelvic exam is unremarkable. The patient is counseled on the importance of regular check-ups, healthy lifestyle habits, and preventive health screenings. As you counsel her about cervical cancer screenings, she asks you about the viruses that cause cervical cancer. Which virus is most commonly associated with the development of cervical cancer?