Statement 1 is Correct: Blockchain's architecture allows data to be shared transparently with relevant stakeholders. Because the ledger is append-only and secured by network consensus, users can view records without the risk of unauthorized alteration.

Statement 2 is Correct: Blockchain operates as a decentralized database (Distributed Ledger Technology). Identical copies of the entire ledger are stored across multiple computers (nodes) on a network. These nodes continuously communicate and sync rapidly (often within seconds, depending on the specific blockchain protocol) to maintain a single source of truth.

Statement 3 is Correct: A consortium blockchain is a hybrid model that blends features of both public (open) and private (closed) blockchains. It is governed by a pre-approved group of organizations rather than a single entity or the open public, allowing for semi-decentralized control and selective data access.

Statement 4 is Correct: Blockchain uses complex mathematical algorithms (cryptographic hashing) to link blocks. Once data is recorded and validated by the network, changing or deleting it requires altering all subsequent blocks and gaining majority network control, making tampering practically impossible.

Note: While all four statements are factually correct based on the principles of blockchain technology, there is no option provided that includes all of them (1, 2, 3, and 4). Option C is the most comprehensive and appropriate choice as it correctly identifies statements 1, 2, and 4 as a valid set.

Therefore, the correct option is C.