單項選擇題

String a = “ABCD”; 
String b = a.toLowerCase(); 
b.replace(‘a’, ‘d’); 
b.replace(‘b’, ‘c’); 
System.out.println(b);  
What is the result? () 

A. abcd
B. ABCD
C. dccd
D. dcba
E. Compilation fails.
F. An exception is thrown at runtime.

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