I'm not sure about creating self-signed certificates for each subdomain, as suggested in options C and D. That seems like it could lead to SSL warnings for the end users, which the question specifically says we want to avoid. I think I'll rule those out and focus on the options that use a proper SSL certificate.
Okay, let me see. Infrared and steam humidifiers use heat, and water canister ones just use a reservoir, so that leaves ultrasonic as the one that rapidly vibrates the water. I think that's the answer.
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