The qiskit-runtime primitives programs 'estimator' and 'sampler' for accessing the IBM Q hardware have the option of error mitigation by setting the 'resilience_level'. Here an overview of the meaning of the various options are given.
But does that mean that only this specified method is active or this and all from 'lower' levels? So eg. when specifying resilience_level=2 do I have the readout error mitigation as well or not? In each case, how do I implement the other case?