A storage device is a kind of hardware, which is also known as storage, storage medium, digital storage, or storage media that has the ability to store information either temporarily or permanently. It is of two typesPrimary storage devices: They are fitted internally to the computer and very fast in terms of accessing data files. 'Secondary storage devices: which are designed to store data permanentlyPen Drive:It is a portable storage device used for data storage that is also known as a Flash drive, thumb drive, data stick, or USB drive and keychain drive. They are connected to a computer via a USB port and are often the size of a human thumb. Hard Disk:It is used to store data permanently as it is a non-volatile computer storage device, and is directly connected to the disk controller of the computer's motherboard. Compact Disk:it is a type of computer memory in the form of a compact disc that is read by optical means is a permanent optical digital storage device?Additional InformationRAM or Random Access Memory (RAM)It is a part of the computers Main Memory which is directly accessible by the CPU. RAM is used to Read and Write data into it which is accessed by the CPU randomly. RAM is volatile in nature, which means if the power goes off, the stored information is lost. Hence it is a primary-volatile memory. Hence the correct answer is (A), (B), and (C) only