Which of the following statements is true regarding the post-hearing brief?
A. It must be filed by union officials, management officials, and the arbitrator after the hearing.
B. It's legally required according to the Supreme Court as evidenced by the Steelworkers' Trilogy.
C. It's useful in cases that involve evidence that's industry-specific or requires deeper analysis.
D. It can be requested only by the losing party in the arbitration hearing