Which is a valid definition of an expression that prefixes each value in a list with 'ID:'?

• A. a!forEach( items: ri!inputValues, Expressions: "ID: " & fv!item )
• B. a!forEach(items: ri!inputValues, Expression: "ID: " & fv!item)
• C. a!forEach( items: ri!inputValues, Expressions: "Name: " & fv!item )
• D. a!forEach( items: ri!inputValues, Expressions: "ID: " & fv!item )

Answer: (D)

Transforming every element of a list by applying an expression to each item is what a!forEach does. Here, you want a new list where each value is prefixed with "ID:". Inside the forEach, the loop variable fv!item represents the current element, so using "ID: " & fv!item concatenates the prefix with the item value for every element. The result is a list of strings like "ID: 123", "ID: 456", etc. This exact expression—using the loop item to build the new string with the "ID: " prefix—produces the desired output. If you used a different prefix (for example, "Name: ") or a different parameter name, you’d get a different result or mis-specified syntax.