Which Statement Correctly Describes Infant Mortality

Which statement correctly describes infant mortality?

A) number of infant deaths during the first 24 hours of life per 100 live births.
B) number of infant deaths during the first 24 hours of life per 1,000 live births.
C) number of infant deaths during the first year of life per 100 live births.
D) number of infant deaths during the first year of life per 1,000 live births.