What Does It Mean If Invasive Meningococcal Disease (IMD) Is

What does it mean if invasive meningococcal disease (IMD) is endemic?

A) There is a steady presence of the disease in a defined geographic area or population group
B) The new cases of the disease exceed the normal occurrence during a given period of time
C) The occurrence of the disease is higher than what would be expected normally
D) The disease spreads and affects a large number of populations worldwide