Conference committees operate after the House and the Senate have passed different versions of a bill. Conference committees exist to draft a compromise bill that both houses can accept. Both houses of Congress must eventually pass identical legislation for the bill to be presented to the President.
Answer:
South Carolina would be the first state to secede from the Union, on December 20, 1860, and would join the newly formed Confederate States of America in the February of the following year.
Cabinet members-- specifically the Secretary of Defense and Secretary of Homeland Security
The President after being elected, nominates their cabinet members. Cabinet members are then affirmed or rejected by Congressional committee. The Cabinet advises the President on all matters of running the government. For issues of defense the Secretary of Defense would be the main adviser. The Secretary of Homeland Security would assist especially in threats against the US land.
I think it is c but d also may be it so i hoped i helped a little!