Final answer:
To show relevant states based on a chosen country, you can create a Constraint rule for each country (Option A), use a data table with a lookup rule (Option B), implement Hiding rules (Option C), or consider that Arrays do not support Constraint rules, which is often incorrect, and thus use Hiding rules (Option D).
Step-by-step explanation:
To show relevant states based on a chosen country in an array set with single-select attributes, you can use several methods. The correct approach depends on the capabilities of the system you are using.
Option A: Create a Constraint rule for each country and specify valid states in the Action attribute. This would mean that the number of rules would match the number of countries in the list.
Option B: Load all country and state combinations in a data table and use a Constraint rule to look up the appropriate states from this table.
Option C: Create Hiding rules for each country and select valid states for the Action attribute, equating the number of Hiding rules with the number of countries.
Option D: States that Arrays do not support Constraint rules, therefore you must use the Hiding rule. However, this statement is usually not accurate, and Constraint rules can oftentimes be applied to array attributes to filter selections.