Correct Answer - Option 3 : 15th August 1972
The correct answer is 15th August 1972.
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PIN Code system was introduced in India on 15th August 1972.
- The pin code system is the post office numbering code system used by the postal service of India.
- It is of 6 digits code.
- It is also known as Zipcode or area postal code.
- The first two digits of the PIN identifies a particular circle.
- The third digit in the PIN code indicates the sorting district within the region.
- The last 3 digits designate the specific post office within the district.