After a Valid Election to Certify a Union Has Been

After a valid election to certify a union has been conducted by the NLRB, another election is:

A) permitted within six months regardless of whether the union wins the certification vote.
B) permitted within six months regardless of whether the union wins or loses the certification vote.
C) is not permitted for three years regardless whether the union wins or loses the certification vote.
D) is not permitted for one year regardless whether the union wins or loses the certification vote.
E) is not permitted for five years regardless whether the union wins or loses the certification vote.