What kind of residents are selected systematically?

Systematic selection involves choosing participants based on a set criteria or systematic approach rather than random sampling. In this context, the correct answer indicates that residents who have at least one care area marked as "FI" are selected for a specific purpose. "FI," which stands for "Fiscal Indicator," may represent certain criteria or conditions pertinent to the survey's focus.

Selecting residents with at least one care area marked FI ensures that the selection process addresses specific issues that need attention. It narrows down the population to include those who may require closer examination or intervention, thus fulfilling the systematic selection's goal of focusing on relevant cases. The systematic approach enhances the efficiency of the survey process by ensuring that participants are not only randomly chosen but are specifically relevant to the indicators of interest.

Other options do not align with the concept of systematic selection, as they either lack a clear criterion for selection or suggest a random approach that does not consider specific conditions critical to the study's objectives.