In which of the following year the Indian National Satellite System (INSAT) was established?

1983

The correct answer is Option (4) → 1983

"On the basis of configuration and purposes, satellite system in India can be grouped into two: Indian National Satellite System (INSAT) and Indian Remote Sensing Satellite System (IRS). The INSAT, which was established in 1983,is a multi-purpose satellite system for telecommunication, meteorological observation and for various other data and programmes."