Problem: In a realist world, states are considered to be "unitary actors." What does this mean? O a. States are assumed to be internally united, without multiple decision makers at the domestic level. O b. States behave in a linear fashion with a clearly observable chain of events that leads to policy. O c. States can only have one foreign policy strategy. O d. States do not reveal their true preferences; they prefer to put on an act on the international stage.