The Difference Between a Schwarzschild Black Hole (SBH) and a Kerr

Multiple Choice

The difference between a Schwarzschild black hole (SBH) and a Kerr black hole (KBH) is

A) overall mass; an SBH contains about 20 solar masses, whereas a KBH is greater than 20 solar masses.
B) that the KBH is electrically charged, whereas the SBH is not.
C) that an SBH is spinning, whereas a KBH is not.
D) that a KBH is spinning, whereas an SBH is not.