Java — Store elements with no duplicates and natural order. Which interface provides this capability?

Introduction / Context:
Different collection interfaces in Java define different rules for storage: duplicates, ordering, and key-value mappings.

Given Data / Assumptions:

• Requirement: no duplicates.
• Requirement: natural order access.

Concept / Approach:
Set interface represents collections with no duplicate elements. SortedSet (e.g., TreeSet) provides natural ordering.

Step-by-Step Reasoning:

Why Other Options Are Wrong:
Only Set ensures uniqueness; TreeSet (implementation) also provides natural order.

Final Answer:
java.util.Set