1. public class Test { 2. public static void main （String args） { 3. unsigned byte b = 0； 4. b--； 5. 6. } 7. } What is the value of b at line 5？（）
- A -1
- B 255
- C 127
- D Compilation will fail.
- E Compilation will succeed but the program will throw an exception at line 4.