The correct answer is A. Read-only.
A read-only disk is a type of data storage device that can only be read from, not written to. This means that the data on the disk is permanently recorded and cannot be changed or erased by the user. Read-only disks are often used for storing important data that needs to be protected from unauthorized access or changes.
There are several different types of read-only disks, including CD-ROMs, DVD-ROMs, and Blu-ray discs. These disks are all made from a type of plastic that is coated with a thin layer of metal. The metal layer is used to store the data on the disk.
When a read-only disk is created, the data is encoded onto the metal layer using a laser. The laser creates tiny pits and bumps on the surface of the disk. These pits and bumps represent the 1s and 0s that make up the data.
To read the data from a read-only disk, a laser is used to scan the surface of the disk. The laser reflects off of the pits and bumps, and the reflected light is then converted into electrical signals. These electrical signals are then decoded to produce the original data.
Read-only disks are a very reliable way to store data. They are also very durable and can withstand a lot of wear and tear. However, they are not as versatile as other types of data storage devices, such as hard drives. This is because read-only disks cannot be erased or rewritten.
In conclusion, the correct answer to the question “A disk’s content that is recorded at the time of manufacture and cannot be changed or erased by user is” is A. Read-only.