Question: Which command do you use to add a value to a Redis stream named mystream?

  1. ADD mystream \* sensor-id 1234 temperature 19.8 1518951480106-1
  2. UPDATE mystream \* sensor-id 1234 temperature 19.8 1518951480106-3
  3. XADD mystream \* sensor-id 1234 temperature 9.8 1518951480106-0
  4. INSERT mystream \* sensor-d 1234 temperature 19.8 15181480106-2

Answer: The correct answer of the above question is Option C:XADD mystream \* sensor-id 1234 temperature 9.8 1518951480106-0