The correct answer is: A. Printed output.
Hard copy is a term used to describe any printed output from a computer. This can include text, images, or other data. Hard copy is often used as a backup or reference, or to share information with others who do not have access to a computer.
Option B is incorrect because hard copy is not a term used to describe writing on a hard board. A hard board is a type of stiff paperboard that is used for a variety of purposes, such as making signs or posters.
Option C is incorrect because hard copy is not a term used to describe storing information on a hard disk. A hard disk is a type of storage device that is used to store data on a computer.
Option D is incorrect because hard copy is not a term used to describe all of the above. Hard copy is only a term used to describe printed output.