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Zbrush 4r6 Retopology

Hello, I’m new in Zbrush so I only know a few things.
I am using Zbrush 4r6

First, I know that you can retopologize by using Zspheres or by using Zremesher.
I want to ask what is the best way in retopologizing a sculpted model in Zbrush if I want to do some cool animations with it.

Second, If i want to retopologize using zspheres through edit topology, where can i find this Rigging Tab?

Thanks

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