# Quiz

+ What are the following statements incorrect about TiKV or TiDB Server?
  + `A` . Data is persisted in TiKV's RocksDB engine
  + `B` . For the recovery of old version data (GC), it is done on TiDB Server on TiKV
  + `C` . Lock information submitted in two phases is persisted to TiDB Server
  + `D` . Region can be scheduled on multiple TiKV nodes, but the PD node needs to issue scheduling instructions

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C