Each party to a five-year review may submit a prehearing brief to the Commission on the date specified in the scheduling notice. A prehearing brief shall be signed and shall include a table of contents. A prehearing brief shall be filed electronically, and nine (9) true paper copies shall be submitted (on paper measuring 8.5 × 11 inches and single-sided) on the same business day. The prehearing brief should present a party's case concisely and shall, to the extent possible, refer to the record and include information and arguments which the party believes relevant to the subject matter of the Commission's determination.