What distinguishes a "sharded" blockchain architecture from a single monolithic chain?

A Sharding splits the network's state and transaction processing across multiple parallel chains ("shards"), each handling a subset of the workload, to increase overall throughput B Sharding means deleting all but one copy of the blockchain entirely C A sharded blockchain processes every transaction on every shard redundantly with zero benefit D Sharding is a synonym for "mining" with no architectural differences