6. Initializing an array is in C# a. required b. optional c. difficult d. prohibited 7. When you declare an array of six double elements but provide no initialization values, the value of the first element is a. 0.0 b. 1.0 c. 5.0 d. unknown 8. Which of the following correctly declares an array of four integers? a.?RE [ ] ages = new int [4] {20, 30, 40, 50); b. int agesnew int] (20, 30, 40, 50); c.?ns [ ] ages = {20, 30, 40, 50); d. all of these 9. When an ages array is correctly initialized using the values 120, 30, 40, 50j, as in Question 8, then the value of ages [1] is a. b. 20 C. 30 d. undefined