Which of these methods can be used to obtain set of all keys in a map?

What is the purpose of the Java Collections Framework?

A. To provide a unified architecture for representing and manipulating collections

B. To provide a way to create arrays

C. To define primitive data types

D. To handle exceptions

Which interface in the Java Collections Framework represents an ordered collection of elements that can contain duplicate values?

A. `Collection`

B. `Map`

C. `Set`

D. `List`

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

Which class is typically used to implement a `List` in the Java Collections Framework?

A. `HashMap`

B. `ArrayList`

C. `LinkedList`

D. None of These