What is the primary difference between a `List` and a `Set` in the Java Collections Framework?
A. A `Set` allows duplicate elements, while a `List` does not
B. A `List` is unmodifiable, while a `Set` is modifiable
C. A `List` allows duplicate elements, while a `Set` does not
D. A `Set` is indexed, while a `List` is not
Answer: Option C

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