Final answer:
The UN's power does not come from a military force or the expense of its operations, but from its international legitimacy and member states' cooperation.
Step-by-step explanation:
The question pertains to the sources of power for the United Nations. It's important to understand that the UN is not powered by its own military force or by the expense of its operations. Instead, the power of the UN largely stems from its international legitimacy and the cooperation of its member states. Therefore, options a) The expense of UN operations and b) Its standing military are not sources of the power of the UN.