单选题Which capability exists only in java.io.BufferedWriter？（）AClosing an open stream.BFlushing an open stream.CWriting to an open stream.DWriting a line separator to an open stream.
单选题
Which capability exists only in java.io.BufferedWriter？（）
A
Closing an open stream.
B
Flushing an open stream.
C
Writing to an open stream.
D
Writing a line separator to an open stream.
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