Briefly define the following terms: (A) Infant Mortality Rate (B) Net Attendances Ratio (C) Literacy Rate

(A) Infant mortality rate is number of deaths under one year of age occurring among the live births in given geographical area during a given year.
(B) Net Attendance ratio is defined as the ratio of the number of people
in the official age-group attending any educational institution in a particular
class-group to the total number of people in the age group.
(C) Literacy rate is the total percentage of the population of an area at a particular time aged seven years or above who can read and write with understanding.