Article II of the U. S. Constitution describes the ...

structure and powers of the legislative branch ...

organization and duties of the executive branch ...

oversight and impeachment powers of Congress ...

creation and support of the federal bureaucracy.

The answer is organization and duties of the executive branch

On the section 2 for example, it's written the power that held by president

"the President shall have Power, by and with the Advice and Consent of the Senate to make Treaties, provided two thirds of the Senators present concur."

In united states, the President is known as the leaders of all executive branches of the government