A president who wants to establish rules and regulations for the operation of a federal agency may do so by taking what action

issuing an executive order.

Explanation:

A president can be defined as an individual who is duly elected by the electorates and as such is the head of the country in a democratic government. The president is empowered by the constitution to sign (veto) legislations, adjourn or convene the legislative body (Congress), grant state pardons and reprieve to citizens, command the armed forces, and welcome ambassadors representing other countries.

In the United States of America, the president has various powers granted by Acts of Congress and Article II of the U.S constitution such as Ordinance power, Appointment power, Implied power, Executive power etc.

An executive order is mainly a direct law from the president of a country and it is granted based on an executive power. By virtue of an executive power, the president is empowered to issue an executive order such as a decree, instructions, regulations and rules in order to successfully manage the affairs of the country and good governance.

Hence, a president who wants to establish rules and regulations for the operation of a federal agency may do so by issuing an executive order.

most cajuns resided in acadiana, where their descendants are still predominant

i would say b. research typically uses a variety of sources