The correct answer is: B. track
A track is a concentric ring on a magnetic disk where data is stored. Tracks are arranged on the disk platters in a spiral pattern, starting from the outside of the platter and moving inward. The number of tracks on a disk platter depends on the size of the platter and the density of the data storage.
A sector is a small section of a track that can store a fixed amount of data. The size of a sector is typically 512 bytes, but it can vary depending on the disk format. Sectors are used to organize data on the disk and to make it easier to read and write data.
A head is a magnetic coil that is used to read and write data on a magnetic disk. The head is mounted on an arm that can move it across the surface of the disk platter. The head is able to read and write data by magnetizing tiny areas on the surface of the disk.
A block is a unit of data that is used to store information on a computer. A block can be a single byte, a group of bytes, or even a file. Blocks are used to organize data on the disk and to make it easier to manage.
None of the above is not the correct answer.