Answer: Concurrency

The question asks what you are primarily scaling for when adding clusters to a multi-cluster warehouse. According to Snowflake documentation and the community discussion consensus (with 100% selecting A and upvoted comments supporting this), scaling out by adding clusters primarily improves concurrency. While performance may also see some improvement as a secondary benefit, the main purpose is to handle more concurrent queries and users simultaneously. The community discussion emphasizes that 'concurrency is the key word here' and that performance improvements are not the primary focus when scaling out.

Author: LeetQuiz Editorial Team