During the 100-yard butterfly, a swimmer is about to finish the fourth length. The head passes the 5-yard mark above the water and while reaching for the finish, the swimmer becomes completely submerged. The referee shall: A. Meet with the starter to confirm dual confirmation of the disqualification. B. Check with the head lane timer to confirm if the swimmer is disqualified. C. Disqualify the swimmer and provide the disqualification slip to the swimmer's coach. D. Consider this as legal and take no action.