Which of the following is an example of optional drives?

The correct answer is that CD ROM, DVD ROM, and Blu Ray are examples of optional drives. These types of drives are largely used for reading data stored on optical media, which is not a necessity for all computer systems, making them "optional."

Throughout the evolution of technology, while all computer systems come with integrated storage solutions like hard drives or solid-state drives (SSD), the use of optical drives for media playback and software installation has declined as cloud storage and digital downloads have become more prevalent.

CD ROM, DVD ROM, and Blu Ray drives serve specific purposes such as media playback, data storage, or software distribution, which may not be essential for every user, unlike fundamental drives like hard Drives or solid-state drives that are necessary for the basic functioning of a computer.

Other options include various drives that are not solely classified as optional drives. The presence of hard drives as an example in other options indicates essential storage components required for the operation of a computer. Thus, understanding which drives serve fundamental functions versus those which are additional helps clarify the concept of optional drives in a computing context.