Based on the situation described in the question, the IoT technology that the company should choose to ensure the highest degree of security is "Azure Sphere."
This is because Azure Sphere is the operating system that Microsoft designs to ensure the dealers of Internet of Things devices increase their security by incorporating a specific system on a chip.
Azure Sphere is known for its protection, high-level application functionalities, and well built-in communication and security traits for internet-connected devices.
Hence, in this case, it is concluded that the correct answer is "Azure Sphere."
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