單項(xiàng)選擇題

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.

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