单选题Which gets the name of the parent directory file “file.txt”？（）A String name= File.getParentName（“file.txt”）；B String name= （new File（“file.txt”））.getParent（）；C String name = （new File（“file.txt”））.getParentName（）；D String name= （new File（“file.txt”））.getParentFile（）；E Directory dir=（new File （“file.txt”））.getParentDir（）； String name= dir.getName（）；
单选题
Which gets the name of the parent directory file “file.txt”？（）
A
String name= File.getParentName（“file.txt”）；
B
String name= （new File（“file.txt”））.getParent（）；
C
String name = （new File（“file.txt”））.getParentName（）；
D
String name= （new File（“file.txt”））.getParentFile（）；
E
Directory dir=（new File （“file.txt”））.getParentDir（）； String name= dir.getName（）；
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