Which BEST describes the difference between a uniform and non-uniform probability model?

Responses
A A non-uniform probability model has outcomes that all have the same chance of occurring. Whereas, a uniform probability model has outcomes that do not all have the same chance of occurring.A non-uniform probability model has outcomes that all have the same chance of occurring. Whereas, a uniform probability model has outcomes that do not all have the same chance of occurring.
B A uniform probability model has outcomes that all have the same chance of occurring. Whereas, a non-uniform probability model has outcomes that do not all have the same chance of occurring.A uniform probability model has outcomes that all have the same chance of occurring. Whereas, a non-uniform probability model has outcomes that do not all have the same chance of occurring.
C A uniform probability model has outcomes that are known. Whereas, a non-uniform probability model has outcomes that are not known.A uniform probability model has outcomes that are known. Whereas, a non-uniform probability model has outcomes that are not known.
D A non- uniform probability model has outcomes that are known. Whereas, a uniform probability model has outcomes that are not known.A non- uniform probability model has outcomes that are known. Whereas, a uniform probability model has outcomes that are not known.

B A uniform probability model has outcomes that all have the same chance of occurring. Whereas, a non-uniform probability model has outcomes that do not all have the same chance of occurring.