How many integer quadruples a,b,c,d are there such that 7 divides ab−cd where 0≤a,b,c,d<7?<spanclass=′latex−bold′>(A)</span>412<spanclass=′latex−bold′>(B)</span>385<spanclass=′latex−bold′>(C)</span>294<spanclass=′latex−bold′>(D)</span>252<spanclass=′latex−bold′>(E)</span>None