Select the Best Statement for Determining How Consensus Is Reached

Multiple Choice

Select the best statement for determining how consensus is reached.

A) By the miner nodes which make sure that a transaction is valid.
B) By a cryptographic secure signature algorithm called ECDSA which makes sure that cheating is impossible.
C) By every single node in the blockchain network different transactions.
D) By every single node in the blockchain network executing the same transaction.