The table below describes four atoms. 
Which atoms represent the same element?
Definitions:
Profit Margins
The difference between the selling price and the cost of goods sold, expressed as a percentage of the selling price, indicating the profitability of a product or business.
Blockchain
A decentralized, distributed ledger technology that records transactions across many computers in such a way that the registered transactions cannot be altered retroactively.
Digital Currencies
Electronic money that exists in the digital space, enabling instantaneous transactions and borderless transfer-of-ownership.
Bitcoin
A decentralized digital currency, without a central bank or single administrator, that can be sent from user to user on the peer-to-peer bitcoin network.
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