Mark is subject to the Longshore and Harbor Workers' Copensation Act. To comply with his responsibilities, he must: A$.$ Secure coverage under the Act through an authorized insurer. B$.$ Become an authorized self$-$insurer. C$.$ Purchase standard workers compensation insurance from any insurer licensed in the state. D$.$ Secure coverage under the Act either through an authorized insurer or by becoming an authorized self$-$insurer?