Exam 70-483 topic 1 question 53 discussion

You are developing an application that includes a class named Order. The application will store a collection of Order objects.
The collection must meet the following requirements:
✑ Internally store a key and a value for each collection item.
✑ Provide objects to iterators in ascending order based on the key.
✑ Ensure that item are accessible by zero-based index or by key.
You need to use a collection type that meets the requirements.
Which collection type should you use?