Which of these is the method for testing whether the specified element is a file or a directory? (a)

Which of these is the method for testing whether the specified element is a file or a directory? (a) IsFile() (c) Isfile() (b) isFile() (d) isfile() Which of the following is a process of writing the state of an object to a byte stream? (a) Serialization (c) File Filtering (b) Externalization (d) All of the mentioned Which of these is a method to clear all the data present in output buffers? (a) clear() (c) fflush() (b) flush() (d) close()