Which of These Is True of an Attenuated Strain of a Pathogenic

Which of these is true of an attenuated strain of a pathogenic microbe infecting a susceptible healthy host?

A) The microbe will NOT replicate in the host.
B) The microbe will replicate in the host but not cause disease.
C) The microbe will replicate in the host and cause disease.
D) The microbe will replicate in the host and ultimately kill the host.
E) The microbe will NOT replicate in the host but will cause disease.