In a MOSFET, the operating region is determined based on the relationship between the drain-source voltage \(V_{DS}\) and the gate-source voltage \(V_{GS}\). For the transistor to operate in the saturation region, the condition \(V_{DS}>V_{GS} - V_{th}\) (threshold voltage) must be satisfied, where the transistor is able to amplify the signal efficiently. In the given scenario with a drain-source voltage of 22V, it satisfies the condition for the saturation region.
Conclusion:
The correct operating region for this MOSFET is in the Saturation region.