Which of the following is true of the caning of Charles Sumner? [Select all that apply.]

- It was a violent incident that occurred in the United States Senate.

- Charles Sumner, a senator from Massachusetts, was the victim of the caning.
- Sumner was attacked by Representative Preston Brooks of South Carolina.
- The caning happened in 1856 as a result of a speech Sumner gave denouncing slavery and southern politicians.