What is the difference between the pilot implementation methodology and the parallel implementation methodology?

Group of answer choices

Pilot implements new software for one group, where parallel uses both new and old systems simultaneously.

Pilot implementation terminates use of old system at a particular date, while parallel gradually implements functions of the new system one at a time.

Parallel implementation terminates use of old system at a particular date, while pilot gradually implements functions of the new system one at a time.

Parallel implements new software first while pilot uses both new and old systems simultaneously.