Final answer:
A Kerr black hole is a type of black hole that is characterized by its rotation, possessing both mass and angular momentum, in contrast to a nonrotating or Schwarzschild black hole.
Step-by-step explanation:
The correct answer is B) rotating black hole. A Kerr black hole is a solution to the equations of Albert Einstein's general theory of relativity. These black holes are characterized by the property of rotation, where they not only have a mass but also angular momentum. In contrast to nonrotating, or Schwarzschild black holes, described by Karl Schwarzschild's solution, a Kerr black hole has an oblate shape due to its rotation and possesses an additional region outside of the event horizon called the ergosphere, where objects cannot remain stationary.
The structure of a basic black hole consists of a singularity surrounded by an event horizon. For a Kerr black hole, the singularity is ring-shaped due to the rotation. Unlike the basic nonrotating black hole characterized by a Schwarzschild radius, the event horizon of a Kerr black hole is more complex because of its rotation and angular momentum.