Answer: A DLT consensus mechanism requires nodes in a network to agree on a common state of the ledger

## Explanation **Option C is correct** because distributed ledger technology (DLT) fundamentally operates on a consensus mechanism where multiple nodes in the network must agree on the validity of transactions and the current state of the ledger. This consensus ensures data integrity and prevents double-spending or fraudulent transactions. **Option A is incorrect** because DLT, particularly proof-of-work blockchain systems (like Bitcoin), is notoriously energy-intensive due to the computational power required for mining and transaction verification. While some newer DLT systems use less energy-intensive consensus mechanisms (like proof-of-stake), the statement that DLT "requires minimal energy" is generally inaccurate. **Option B is incorrect** because one of the core features of DLT is immutability. Once a transaction is recorded on a distributed ledger and validated through consensus, it cannot be easily deleted or altered. This immutability is a key security feature that prevents tampering and ensures trust in the system. **Key Concepts:** - **Consensus Mechanism**: The process by which nodes in a DLT network agree on the validity of transactions and the current state of the ledger. - **Immutability**: Once data is written to a distributed ledger, it cannot be altered or deleted, ensuring data integrity. - **Energy Consumption**: Varies by consensus mechanism, with proof-of-work being energy-intensive and proof-of-stake being more energy-efficient.

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