A government agency is currently using Business Rules Engine (BRE).

Two Decision Matrices provide the cleanest and appropriate Business Rules Engine design because the scenario contains two independent lookup domains . The first matrix represents the federal income-limit values applicable to household size or related criteria. The second maps the calculated percentage of Area Median Income to the appropriate prioritization pool.

Salesforce defines Decision Matrices as tables that match supplied input values against rows and return corresponding output values. Expression Sets can invoke these matrices and combine the results with calculations, variables, and constants.

The Expression Set would therefore obtain or calculate the applicable household AMI percentage by referencing the federal-income-limit criteria and then pass that calculated percentage into the prioritization matrix. Separating these rule sets is preferable to placing unrelated policy dimensions into one monolithic matrix. It improves maintainability because federal limits can change independently of an agency's prioritization thresholds.

Option D unnecessarily creates a third matrix for household data. Household income and household size are transactional inputs , not reference-policy values that inherently require their own Decision Matrix. Option A omits the Federal Income Limit lookup, while B improperly combines two independently maintained rule sets.

This modular design also supports policy changes without rebuilding the Expression Set itself.

Study Guide Reference: Public Sector Solution Product Configuration – Business Rules Engine; Expression Sets; Decision Matrices; policy lookup tables; AMI and prioritization calculations.

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