Thelma writes a list of four digits consisting of 1, 3, 5, and 7, and each digit can appear one time, multiples time, or not at all. The list has a unique mode, or the number that appears the most. Thelma removes two numbers of that mode from the list; her list now has no unique mode! How many lists are possible? Suppose that all possible lists are unordered. <spanclass=′latex−bold′>(A)</span>18<spanclass=′latex−bold′>(B)</span>24<spanclass=′latex−bold′>(C)</span>30<spanclass=′latex−bold′>(D)</span>36<spanclass=′latex−bold′>(E)</span>48