According to Hoffman, what primarily distinguishes terrorists from national armed forces?

a. National armed forces do not use violence in a way that might kill civilians, while terrorists exclusively target civilians.
b. National armed forces use violence for purely military purposes, while terrorists use it for purely "political theater."
c. National armed forces generally operate within rules of warfare and codes of conduct.
d. National armed forces have more sophisticated weaponry and greater numbers.
e. The violent actions of national armed forces often spill over into third-party countries, whereas terrorists' acts of violence are more narrowly focused on their perceived oppressors.

Answer: c