GETH:
A . is the reference implementation of the Ethereum protocol and every other node implementation internally uses the closed-source from Geth.
B . is the library that is used for the blockchain node Go-Ethereum. It is also used by Parity is parts, because it’s closed source.
C . is one of the many blockchain nodes that implement the Ethereum Protocol. It’s open source and everyone can contribute.
Answer: C
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