The correct answer is: D. Serial access medium.
Magnetic tape is a serial access medium because data is stored on the tape in a linear fashion, and the tape must be read or written to sequentially from beginning to end. This means that it can be slow to access data that is not at the beginning of the tape.
A random access medium is a storage device that can access any data on the device without having to read or write all of the data before it. This makes random access media much faster than serial access media for accessing data that is not at the beginning of the device.
A parallel access medium is a storage device that can access multiple pieces of data at the same time. This makes parallel access media faster than serial access media for accessing multiple pieces of data.
A universal access medium is a storage device that can be accessed by any type of computer. This is not a technical term, and there is no single device that meets this definition.