Final answer:
The UN's executive functions are carried out by the Secretariat, led by the Secretary-General. For the multiple choice regarding the executive branch, the Security Council is the closest to an executive role among the options.option b is correct answer.
Step-by-step explanation:
The executive branch of the United Nations is effectively administered by the Secretariat, which is headed by the Secretary-General. This body is responsible for the day-to-day operations of the UN, executing the decisions of other UN bodies such as the General Assembly and the Security Council. The Secretary-General acts in a leadership role, carrying out diplomatic engagements and managing administrative tasks.
Regarding the multiple choice question provided, the option that serves as the executive branch is not explicitly listed; the correct answer would be 'the Secretariat,' which is not an option. However, if we must choose from the given options, the Security Council is the closest in function to an executive role, as it is charged with maintaining global peace and stability and has the power to make binding decisions that member countries must adhere to.
To address the additional question, the primary organ of the United Nations that is not listed as one of the primary organs in the options is 'd) World Congress,' which does not exist as a UN body.