What is the most appropriate scope for a data page designed to fetch daily updated exchange rates from a web service?

Choosing a node scope for a data page that fetches daily updated exchange rates from a web service is appropriate because this scope allows the data page to be shared across all users and threads within a specific node. By setting the scope to node, the data page can efficiently store and manage the exchange rate information in a centralized manner, which is especially beneficial for data that doesn't change frequently throughout the day.

Given that exchange rates are updated daily, this data page can retrieve data from the web service once per day and store it in memory. This eliminates the need for each individual user or thread to fetch the exchange rates separately, thereby reducing load on the web service and improving performance by offering quick access to the information.

With request scope, the data page would only last for the duration of the user's interaction, requiring repeated calls to the web service for each request. Application scope would encompass the entire application but may not offer the performance optimization of node scope, particularly for frequently accessed data like exchange rates. Thread scope would be even more restrictive and would limit availability to a single thread, which is not suitable for a widely requested service like exchange rates.

Thus, node scope is the most efficient and practical choice for handling the daily updates and ensuring accessible and efficient use of