(Epidemiology Review) Rapid response teams (RRT) are teams of health care providers that respond to hospitalized patient

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(Epidemiology Review)
Rapid response teams (RRT) are teams of health care providersthat respond to hospitalized patients with signs of deteriorationin non-intensive care units to prevent respiratory or cardiacarrest.
You are interested in evaluating whether the presence of a RRTreduces mortality due to sudden cardiac arrest. For yourevaluation, you compare data gathered in 2016 from two similarhospitals, one with and one without a RRT.
Select the evaluation study design that this best describes:
Combination design
Randomized design
Before-after design
Simultaneous nonrandomized design