What is the full form of AD?
a. After death
b. Anno domini
c. After dark
d. After Dusk

Hint: The purpose of naming the dating system as BC and AD was to make the birth of Jesus Christ as the point of dividing history of the world.

complete Answer:
The full form of AD is Anno Domini. This is a Medieval Latin and means ‘year of the Lord’. The terms BC (Before Christ) and AD (Anno Domini) are used to label or number the years in the Julian and Gregorian calendars.
This calendar era is derived from the traditionally reckoned year of the birth of Jesus. AD counts years from the start of this epoch and BC denotes years before this. There is no year in this scheme, so the year AD 1 immediately follows the year BC 1.
This dating system was developed by Dionysius Exiguus in the year 525 but was widely used after 800.

Note: The Gregorian calendar is the most widely used calendar today. It has been used for international communication, transportation and commercial integration and also has been recognized by many international institutions like the United Nations.