When displaying a pie chart whose data is stored in a local variable in the parent interface and used by a child interface, what is the most efficient method to access that data in the child?

When displaying a pie chart whose data is stored in a local variable in the parent interface and used by a child interface, what is the most efficient method to access that data in the child?

• A. Read the data directly from the parent interface's local variable in the child.
• B. Query the data from the database.
• C. Create a rule input on the child interface and pass the local variable data from the parent interface.
• D. Store the data in a global constant in the child interface.

Answer: (C)

Share the data through a rule input on the child interface and pass the parent’s local variable value when you render the child. This keeps data flow explicit and the child reusable, while avoiding coupling to the parent's internal scope. Since the pie chart data is already in memory in the parent, there’s no need to query the database or duplicate the data in a global constant; using a rule input uses the existing value directly and efficiently. Directly reading the parent’s local variable from the child isn’t possible due to scope isolation, and making the child rely on a constant would freeze the data and break dynamic updates.

Share the data through a rule input on the child interface and pass the parent’s local variable value when you render the child. This keeps data flow explicit and the child reusable, while avoiding coupling to the parent's internal scope. Since the pie chart data is already in memory in the parent, there’s no need to query the database or duplicate the data in a global constant; using a rule input uses the existing value directly and efficiently. Directly reading the parent’s local variable from the child isn’t possible due to scope isolation, and making the child rely on a constant would freeze the data and break dynamic updates.