What is the difference, if any, between slander and libel?

A) Libel is illegal, while slander is legal but still considered unethical.

B) Libel is made in public in a verbal way, and slander is written.

C) Slander is illegal, while libel is legal but still considered unethical.

D) Slander is made in public in a verbal way, and libel is written.