A Northrop Grumman-built Cygnus cargo ship, a space supply ship to car

A Northrop Grumman-built Cygnus cargo ship, a space supply ship to carry vital supplies for astronauts on the International Space Station (ISS), was launched by

ISRO
Space X
NASA
Skylab
This question was previously asked in
UPSC SO-Steno – 2017
Northrop Grumman-built Cygnus cargo ships are launched to the International Space Station as part of NASA’s Commercial Resupply Services program. While Northrop Grumman built the spacecraft and initially used their Antares rocket, they have also contracted with other launch providers. SpaceX’s Falcon 9 rocket has been used to launch Cygnus missions, especially in recent times when other launch vehicles were unavailable. Therefore, SpaceX is a correct answer for who launched a Cygnus cargo ship.
Cygnus is a spacecraft for delivering cargo to the ISS. The company that builds the spacecraft (Northrop Grumman) is not always the company that provides the launch vehicle and services.
NASA is the customer for the service (delivery of cargo to ISS) but typically procures launch services from commercial providers like SpaceX, United Launch Alliance (ULA, which operates Atlas V), or Northrop Grumman (Antares). The question asks who “launched” it, which refers to the entity operating the launch vehicle.
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