Which of the following describes the selection of federal judges?
the president nominates someone to fill a vacancy, and the senate confirms the choice.
the senate nominates someone to fill a vacancy, and the president confirms the choice.
the president nominates someone to fill a vacancy, and the house confirms the choice.
the house nominates someone to fill a vacancy, and the president confirms the choice.

The men and women who serve as judges and justices are considered as the main actors of the federal system. As stipulated in Article II of the U.S. Constitution, The President nominates (shall nominate) and by and with the advice and consent of the Senate, shall appoint federal judges. 

Therefore the answer to the question above is " The president nominates someone to fill the vacancy , and the Senate confirms the choice."

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congress also has implied powers, which derive from the necessary and proper clause of the constitution and permit congress "to make all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states.