Final answer:
Appointments for positions such as an alternate deputy, deputy, and sub-deputy in Washington D.C. are carried out in a manner directed by the U.S. Congress.
Step-by-step explanation:
The question refers to the appointments made within the governance structure of Washington D.C., which is the District constituting the seat of government of the United States.
According to the directive provided, the Congress is responsible for directing the manner in which appointments such as an alternate deputy, deputy, and sub-deputy are made in the District. Therefore, these appointments shall be carried out as per the methods prescribed by Congress.