Topic ACQ 2020 part A

When selecting a software developer,whichoneof the following should contractors possess(Selectallthat apply) ?

Answer

I responded with the following answer, and it was marked incorrect:

Domain experience in developing comparable software systems, Successful past performance record, Demonstrable mature software development capability and processes

I tried again with the following response and it was marked incorrect:

Domain experience in developing comparable software systems, Maturity level four, Demonstrable mature software development capability and processes

What is the correct answer??