1. Which of the following are valid array declarations? If it is not valid write a valid statement. (2 pts) a. char [26] charArray-new char [26; b. int [10] words = new int[]; c. char) charArray"Computer Science" d. double [ ] nums {3.5, 35.1, 32.0); 2. Write the output of the following code: (2 pts) public class Hw7 public static void main (Stringt args) fortrintineO ;nit10?. length; ++) System.out.printin (x[i]) 3. Write a method that takes an array of Strings as a parameter and the number of elements currently stored in the array, and returns a single String that is the concatenation of all Strings in the array. (3pts)