Final answer:
option c,To configure fault-tolerant access to Exchange Online via a smartphone, you should use a mobile device management (MDM) solution.
Step-by-step explanation:
The correct answer is c) Use a mobile device management (MDM) solution. Setting up a Fault Tolerant access to Exchange Online via a smartphone requires a mobile device management (MDM) solution. MDM solutions provide centralized control and management over smartphones and ensure that Exchange Online access remains available even if one device fails.
Option a) Use a different smartphone model is not the correct answer because it does not address the fault tolerance aspect of the question. Option b) Set up multiple Exchange Online accounts on the smartphone is also incorrect because it is not the recommended approach and may lead to confusion and inefficiency.
Therefore, the best way to configure fault-tolerant access to Exchange Online via a smartphone is to use a mobile device management (MDM) solution.