The Key Intuition of a Z-Score Model Like Altman's Is

The key intuition of a Z-score model like Altman's is that:

A) only publicly traded firms can be evaluated.
B) one will be just as well off by guessing on default rates.
C) all corporations will default at least once.
D) financial profiles of bankrupt and non-bankrupt firms are very different one year prior to bankruptcy.
E) privately traded firms disclose better financial information to lenders.