Question: Which of the following statements about constraint-based sets is correct?

Options:

1. All elements in a constraint-based set must be unique.
2. Constraints can be both inclusive and exclusive.
3. Constraints do not affect the size of the set.
4. All elements must be integers.

Correct Answer: Constraints can be both inclusive and exclusive.

Solution:

Constraints can be both inclusive (allowing certain elements) and exclusive (disallowing others), affecting the composition of the set.