正确生成RandomAccessFile对象的语句是 ( ) A．File f=new File("readFile")； B．RandomAccessFile raF=new RandomAcccssFile(d:mydirFile3.txt，"rw")； C．RandomAccessFile raF=new RandomAccessFile("readwriteFile"，"rw")； D．RandomAccessFile raF=new RandomAccessFite("readwriteFile"，rw)