public class MyLogger { private StringBuilder logger = new StringBuuilder（）； public void log（String message， String user） { logger.append（message）； logger.append（user）； } } The programmer must guarantee that a single MyLogger object works properly for a multi-threaded system. How must this code be changed to be thread-safe？（）

A. synchronize the log method
B. replace StringBuilder with StringBuffer
C. No change is necessary， the current MyLogger code is already thread-safe.
D. replace StringBuilder with just a String object and use the string concatenation （+=） within the log method