Which of the Following Are Common Elements in Definitions of Terrorism

Which of the following are common elements in definitions of terrorism?

A) systematic use of physical violence
B) the attempt to cause religious, political, or social change
C) violence only against combatants
D) both systematic use of physical violence and the attempt to cause religious, political, or social change
E) systematic use of physical violence; the attempt to cause religious, political, or social change; and violence only against combatants