Primary spermatocyte, 4N or 2N?

[stronghold]

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FA states that primary spermatocyte is diploid (2N, 4C). While Kaplan Qbank states 4N!
I hope somebody could explain the difference between N and C so I can understand it

 

[NeuroLAX]

https://en.wikipedia.org/wiki/Spermatogenesis