Your company has recently been hired to install a smart security system for a large office building. The system will include security cameras, voice$-$controlled lights, smart locks, and smart thermostats. Some of the security cameras will be installed outdoors throughout the parking lot. Which wireless IoT protocol should your company use for the installation?

a$.$ Bluetooth, because it is easiest to configure

b$.$ Zigbee, because it is always encrypted

c$.$ Z$-$Wave, because it is the fastest wireless standard

d$.$ Wi$-$Fi$,$ because it is always encrypted