Several prototypes were tested for a water resistant phone. The design used the same material in different thicknesses, but none were able to stop water leakage for more than four minutes. The prototypes met all of the other criteria, including cost, size, and style. What should the designers do next to produce the best water-resistant phone? A. Remove the criterion for the phone to be water resistant.

B. Reset the criterion to have the phone to be water resistant for up to four minutes.

C. Use the same material, but make the phone even thicker, and test the new prototype.

D. Test the design using an alternative type of material that deflects water, though the cost may have to be adjusted.