# Quiz
+ What are the following statements about TiDB Backoff wrong?
  + `A` .Common backoff types are PDRPC, RegionMiss, ServerBusy, TikVRPC, TxnLock, TxnLockFast, UpdateReader
  + `B` . You can see the recent backoff type and retry time from KV Errors under TiDB Dashboard
  + `C` The backoff type corresponding to the slow query and the retry time are recorded in the.tiDB Slow log
  + `D` . If the monitoring sees a backoff, there may be a problem with the cluster

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Answer: D