German measles virus (rubella), a common cause of exanthema in children, is best described by which of the following statements A: Measles (rubeola) and German measles (rubella) are caused by the same virus B: Incubation time is approximately 3 to 4 weeks C: Vesicular rashes are characteristic D: Onset is abrupt with cough, coryza, and fever E: Specific antibody in the serum does not prevent disease