Which of the following filename extension suggests that the file is a backup copy of another file?

Answer: Option 2 Let'

Answer: Option 1 Let'

Answer: Option 3 Let'

Answer: Option 1 Bak extension is commonly used to store backup copies of files so that it can be restored later when original file is corrupted or deleted. Bas extension...

Answer: Option 4 First and second options are obviously wrong since specifying filename will list for that filename only. Since we need to list only with .exe extension fourth option...

Answer: Option 4 Let'

Answer: Option 2 Let'

Answer: Option 3 Its prototype is int touch(string filename [, int time [, int atime]]). It returns TRUE on success or FALSE on error.

Answer: Option 1 Just change the .php to .html and your extension will change. This is used for security purpose.

Answer: Option 1 In computing, ".bak" is a filename extension commonly used to signify a backup copy of a file.