The correct answer is D) All of the above. Each hose used for transferring vapors must: 1) Be electrically continuous with a maximum resistance of ten thousand ohms to prevent static electricity buildup and potential ignition of flammable vapors. 2) Have a design burst pressure of at least 25 psig to withstand the pressures encountered during transfer operations. 3) Be capable of withstanding at least 2.0 psi vacuum without collapsing or constricting to prevent damage to the hose and maintain vapor flow. All of these requirements are specified in the regulations for the design and use of hoses for vapor transfer to ensure safe and reliable operation.