Which cybersecurity protocol is specifically designed for building automation systems and is commonly implemented in modern architectural designs for smart buildings?

As smart buildings become increasingly integrated with IoT devices and automated systems, cybersecurity has become a critical concern for architects and building designers. Modern architectural practices must now consider digital security alongside physical security. This trivia question tests your knowledge about cybersecurity considerations in contemporary architectural design for commercial and residential smart buildings.

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BACnet/SC (BACnet Secure Connect)
HTTPS (HyperText Transfer Protocol Secure)
AES-GCM (Advanced Encryption Standard-Galois/Counter Mode)
OAuth 2.0 (Open Authorization)