# Quiz

+ Are the following functions implement by TiKV or TiFlash? (Select 2)
  + `A` . Issue a scheduling command based on the information of the region in the cluster
  + `B` . Business isolation for OLAP and OLTP
  + `C` . Convert relational data to KV storage for persistence
  + `D` . Convert KV storage to relational data and return it to the client
  + `E` . The unique ID of the transaction generated with TiDB Server
  + `F` . High availability and consistency of... replicas

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B, F