A 19-yeаr-оld pаtient presents tо the primаry care оffice with complaints of an upset stomach and transient upper abdominal pain. She reports that she had unprotected sex 2 months ago and is fearful she has caught a sexually transmitted disease. She denies any vaginal symptoms. She states that her "belly hurts" the worst around the time of her period or during high stress times. Her pregnancy test today was negative. Pelvic exam was normal and wet mount was negative. You order a hepatitis serology panel. The following are the results: Which of the following is the accurate interpretation of these serology results: HBsAg= negative Anti-HBc= negative IgM Anti-HBc= negative Anti HBs= positive