Consider the characteristics of the government system known as gana or sangha in Vajji, with its capital at Vaishali. Select the correct statements from the options provided below:

a) The system of governance was characterized by the presence of multiple rulers, each referred to as a raja.

b) The rajas would collectively perform rituals and make decisions through discussions and debates in assemblies.

c) Participation in the assemblies was restricted to rajas, excluding women, dasas, and kammakaras.

d) The gana or sangha system was a form of monarchy with a single ruler making all governing decisions.