What Is the Definition of Eradication of an Infectious Disease

What is the definition of eradication of an infectious disease?

A) Ten or more developed countries have gone ten years without reporting one case.
B) There are no longer any cases of the microbe anywhere in the world for three consecutive years.
C) The patient no longer shows any symptoms.
D) There are no longer any cases of the microbe in the country.
E) The patient has a zero blood count for the infectious microbe.