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The concept of a node is common in most blockchains.

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The concept of a node is common in most blockchains. Which of the following about nodes is INCORRECT? 

A.

Nodes need a valid certificate to be able to communicate to the network

B.

Nodes connect to other nodes and that is how a blockchain is formed

C.

These three types of nodes. Client, peer and Ordered

D.

Nodes use a type of client server protocol for keeping the distributed ledger in sync across the network

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