Your question is Inverter Design With Digital Logic. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Design an inverter using digital logic.
Explain the logic implementation, identify the required inputs and outputs, and describe how you would validate correct behavior. State any assumptions and discuss relevant design trade-offs.