Final answer:
Blockchain is the most likely IT trend used when a transaction Dana made is recorded in a public database, due to its distributed and secure nature.
Step-by-step explanation:
If Dana has performed a transaction online and it is recorded in a public database, the most likely future IT trend used in this scenario would be A) Blockchain. Unlike traditional databases, blockchain is a distributed ledger technology where each transaction is recorded across many computers, making it exceptionally secure due to its immutable and transparent nature. This is because each 'block' in the blockchain contains a number of transactions, and every time a new transaction occurs on the blockchain, a record of that transaction is added to every participant's ledger.
It's different from Quantum computing which pertains to computational power; Edge computing which refers to processing data near the edge of the network, where the data is being generated, rather than in a centralized data-processing warehouse; and 5G technology which is related to the newest generation of mobile networks and has more to do with enhanced data transmission speeds and connectivity than with the way transactions are recorded.