Question: When is there a consensus? a . When, in a smart contract, the private key and the public key match b . When the value

When is there a consensus?
a.
When, in a smart contract, the private key and the public key match
b.
When the value of a bitcoin proposed by a seller is accepted by a buyer
c.
When several nodes (usually most nodes on the network) all have the same blocks in their locally-validated best blockchain
d.
When a smart contract executes the rules agreed by all parties

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