Clarification on MultiClassClassifier

Hi,
looking at the documentation [https://www.cs.waikato.ac.nz/ml/weka/Witten_et_al_2016_appendix.pdf] it seems that whenever a MultiClassClassifier is used, the multi-class problem is treated as a binary one (I guess comparing one class vs the rest). However, there is no reference on how the problem is handled without toning the base classifier. To be clear:
1. if I use i.e. a Random Forest or J48 classifiers for multiclass classification, is the problem treated as a binary one by default?
2. How can I understand if the problem is handled as binary or multiclass?
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