Concept:To take a copy of data home, the storage device must be portable and able to store data safely when the computer is off.Explanation:I. RAM is volatile, so data is lost when power is off.II. Floppy disk can store data and is portable.III. Pen drive can store data and is portable.IV. Hard disk is normally fixed inside the computer system and is not carried home easily.Therefore, Floppy disk and Pen drive only are suitable.Answer:C. II and III only