What is the difference between "horizontal sharding by range" and "sharding by hash"?

A Range sharding assigns contiguous ranges of a key to each shard (good for range queries but risks uneven load); hash sharding distributes keys more evenly via a hash function but makes range queries harder B Range sharding and hash sharding always produce identical data distributions C Hash sharding can only be used with exactly one shard D Range sharding requires that all data be stored in a single shard always