Which expression correctly returns the contact's age in a FinancialSummary Detail View?

The correct expression for returning the contact's age in a FinancialSummary Detail View is found in the first option. This expression utilizes type casting to ensure that the ABContact from myFinancialSummary is treated as an ABPerson object, which is the appropriate type that contains the Age attribute.

In Guidewire, when dealing with different data types, type casting is an important practice. The use of (myFinancialSummary.ABContact as ABPerson) ensures that the system understands which specific attributes and methods belong to the ABPerson class, thus allowing access to the Age attribute without any runtime issues. This clarifies the type identity, providing greater safety and accuracy in accessing properties related to the person's information.

Other choices either do not appropriately cast the type or attempt methods that are not supported in this context. Therefore, the first option correctly reflects both the requirement for type specificity and access to the Age information.