In your IoT infrastructure, you have several low-resource Raspberry Pi devices which you need to use as translation gateways, in order to integrate legacy sensors into your solution. In addition, you have some high-power devices which run Stream Analytics jobs. The Raspberry devices communicate via MQTT while the more powerful edges use AMQP. Dusing testing the solution you experience that Pi devices often fail to connect or stop sending telemetry after a certain period. 
What (select two) would you do to prevent this behavior?

Answer options:

A.Set the amqpSettings__enabled to False
B.Set the OptimizeForPerformance variable to False
C.Set the amqpSettings__enabled to True
D.Set the OptimizeForPerformance variable to True
E.Increase the timeToLive value

Correct Answers: A and B
Option A is CORRECT becauseturning off the protocol heads for protocols the device is not using can help in reducing the memory usage.
Option B is CORRECT because by default, the IoT Edge Hub is optimized for performance which, on the other hand, requires more memory on the device. When experiencing memory problems, disabling the optimized behavior might help.
Option C is incorrect because on the opposite, the not used protocols like AMQP should be disabled in order to save memory.
Option D is incorrect because on the opposite, the performance optimization should be disabled in order to save memory.
Option E is incorrect because the time for temporarily storing the messages on the device should rather be decreased if you want to decrease the memory requirements.
Diagram: 

References: 

https://docs.microsoft.com/en-us/azure/iot-edge/production-checklist?view=iotedge-2018-06#reduce-memory-space-used-by-iot-edge-hub
https://docs.microsoft.com/en-us/azure/iot-edge/troubleshoot-common-errors?view=iotedge-2018-06#stability-issues-on-smaller-devices