单选题Which determines if “prefs” is a directory and exists on the file system？（）A Boolean exists=Directory.exists （“prefs”）；B Boolean exists=（new File（“prefs”））.isDir（）；C Boolean exists=（new Directory（“prefs”））.exists（）；D Boolean exists=（new File（“prefs”））.isDirectory（）；E Boolean exists=true； Try{ Directory d = new Directory（“prefs”）； } catch （FileNotFoundException e） { exists = false； }
单选题
Which determines if “prefs” is a directory and exists on the file system？（）
A
Boolean exists=Directory.exists （“prefs”）；
B
Boolean exists=（new File（“prefs”））.isDir（）；
C
Boolean exists=（new Directory（“prefs”））.exists（）；
D
Boolean exists=（new File（“prefs”））.isDirectory（）；
E
Boolean exists=true； Try{ Directory d = new Directory（“prefs”）； } catch （FileNotFoundException e） { exists = false； }
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