X corporation forms a limited liability company (LLC) in which X is the only owner.  For federal tax purposes, per the "check-the-box" regulations, the LLC will be treated as: 

A. A branch or division of X unless an election is made to treat the LLC as a corporation

B. A corporation, unless an election is made to treat the LLC as a partnership 

C. A partnership, unless an election is made to treat the LLC as a corporation 

D. None of the above