The main difference between Bayesian and Shafer-Dempster systems of probability is:

A. Shafer-Dempster is simply not accepted by the mathematical community.
B. Shafer-Dempster leaves room for future information to fill in present uncertainty.
C. Bayes has been discredited since it is so old.
D. Bayes uses past and prior probabilities for updates while Shafer-Dempster uses present and future probabilities.
F. None of the above are true