An organization has two lines of business: selling books for children and reselling college textbooks.

In a scenario where an organization operates two lines of business with similar UI needs but differing payment methods, applying the Situational Layer Cake™ concept allows for efficient reuse of common functionalities while accommodating specific differences.

B. Place the UI rules and generic payment method rules in the base layer, and create a new layer for the division-specific payment rules: This approach maximizes reuse by placing the shared UI components and any generic payment functionalities that apply to both divisions in the base layer of the application. Division-specific payment methods are then managed in separate layers on top of the base layer, allowing for tailored handling of payment options without duplicating the common UI elements.

Option A suggests a new layer for both lines of business, which might not efficiently leverage the commonalities between them. Creating a parallel base layer for payment rules (C) deviates from the hierarchical structure intended by the Situational Layer Cake™. Option D, creating a new layer for each division's payment rule, aligns with option B but is less clearly articulated regarding the placement of shared UI rules.