How Do Discs, Like the One in the Accompanying Figure

Multiple Choice

How do discs, like the one in the accompanying figure, commonly store items?

A) in random locations anywhere between the center of the disc and the edge of the disc
B) in multiple pie-shaped sections that break a track into arcs
C) in a single track that spirals from the center of the disc to the edge of the disc
D) in multiple concentric tracks from the center of the disc to the edge of the disc