You work for an automotive manufacturer that already has an Azure IoT solution in place. The solution collects millions of data from thousands of field equipment like presses, welding robots, conveyors etc. The quality department wants to add an improvement which provides them with near real-time hints on the trends that are taking shape, so that unfavorable events can be predicted. You have just started designing the data stores for the new Time Series Insight (TSI) Gen2 solution. 
Which two of the following statements are wrong?

Answer options:

A.Querying on the warm storage is free
B.The retention time in warm storage is 7-30 days
C.Querying on the cold storage incurs extra cost
D.Querying on the warm storage incurs extra cost
E.Multiple TSI event sources can use the same consumer group in IoT Hub

Correct Answers: D, E 
Note - The question is asking for TWO WRONG statements.
Option A is an incorrect choice because you can run queries on the warm store with no additional cost.
Option B is an incorrect choice because the minimum retention time of the warm store is 7 days which can be increased up to 30 days.
Option C is an incorrect choice because, unlike the warm store, when running queries against the cold store, additional costs can come up.
Option D is a CORRECT choice because queries against the warm storage are free.
Option E is a CORRECT choice because each Azure Time Series Insight event source must have its dedicated consumer group, not shared with any other consumers. Otherwise, all readers are at the risk of failures.
Reference: 

https://docs.microsoft.com/en-us/azure/time-series-insights/how-to-plan-your-environment#the-gen2-environment