Question 9 Which of the following statements about C file I/O are true? Opening a file with a mode of "w causes any existing data in the file to be erased W The results from the feof function is only valid after a read has been made B fputs automatically adds a to the end of its output @ Reading a binary file in text mode on Windows may result in early detection of end-of-file The fgets function is inherently unsafe and should be avoided D Storing the result of feetc in a char variable may make end-of-file detection unreliable