A. A written agreement to submit any existing or subsequent controversy arising between the parties to arbitration is valid, enforceable, and irrevocable except on a ground that exists at law or in equity for the revocation of a contract.

B. An arbitrator shall decide whether a condition precedent to arbitration has been fulfilled and whether a contract containing a valid agreement to arbitrate is enforceable.

C. If a party to a proceeding challenges the existence of, or claims that a controversy is not subject to, an agreement to arbitrate, the arbitration proceeding may continue pending final resolution of the issue by the Commission, unless the Commission otherwise orders.