Array a= { 6,1,10, 9, 7, 4, 8, 2, 15 }; After the second iteration of the quick sort the array becomes a. a={4 1 2 6 79 8 10 15} O b. a= {2 1 4 6 7 9 8 10 15} C. a={6 1 4 2 79 8 10 15} d. a={1 2 4 6 798 10 15}