3 Question 31 (1.5 points) When the buffer is flushed, all the data contained in it is written to the physical medium (if it is an output stream). This process is called synchronization and takes place under any of the following circumstances: When the file is updated: when updating a file, all buffers that have not yet been flushed are synchronized and all pending data is written or read to the physical medium every statement using << operators. When the buffer is full: Buffers have a certain size. When the buffer is full it is automatically synchronized. Explicitly, with manipulators: When certain manipulators are used on streams, an explicit synchronization takes place. These manipulators are: sync and endl. Explicitly, with member function buffer(): Calling the stream's member function buffer() causes an immediate synchronization. This function returns an int value equal to -1 if the stream has no associated buffer or in case of failure. Otherwise (if the stream buffer was successf