Question: You are designing security for an IoT device application. What best practices should you include in your design?

1. Use a private key for each device. Keep the private key secret.
2. Use a public key for each device. Keep the public key secret.
3. Use a public private key pair for each device. Keep the public key secret.
4. Use a public private key pair for each device. Keep the private key secret.

Answer: The correct answer of the above question is Option D:Use a public private key pair for each device. Keep the private key secret.