Which best describes a role of the executive branch of the federal government?

To put it in the most basic way:
The legislative branch makes the laws (Senate and the House of Representatives).
The executive branch carries out the laws (President).
The judicial branch interprets the laws (Supreme Court).

The Executive power of the Federal Government is vested into the  President of the United States. The President acts as "Chief of State":

He is the boss of millions of governments workers who work at the agencies of the Executive Branch. He also decides the best way to enforce the laws provided by the Legislative Branch.He is entitled to hire specialists who would serve as advisors regarding certain affairs on public policy.