Which of the following are valid declarations? which instantiate an array object? explain your answers. int primes = {2, 3, 4, 5, 7, 11}; float elapsedtimes[] = {11.47, 12.04, 11.72, 13.88}; int[] scores = int[30]; int[] primes = new {2,3,5,7,11}; int[] scores = new int[30]; char grades[] = {'a', 'b', 'c', 'd', 'f'}; char[] grades = new char[];