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.
Teddy
7 months agoKimberely
7 months agoElvera
7 months agoOrville
7 months agoKris
8 months agoMyra
8 months agoMaybelle
8 months agoMerilyn
8 months agoLoren
8 months agoMinna
8 months agoJulian
8 months agoRaymon
8 months agoArlene
8 months ago