# Quiz

+ What is the correct reason for the high latency of TiKV Coprocessor duration? 
  + `A` . Wide scan
  + `B` . Hot spots for read small tables
  + `C` . Cop thread pool full
  + `D` . Occurs Write stall

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Classroom tests
2. What is the correct reason for the high latency of TiKV Coprocessor duration? 
  1. Scan a wide range
  2. Hot spots for read small tables
  3. Cop thread pool full
  4. Occurs Write Stall