Answer:
Option 3 i.e., Z-Wave.
Explanation:
The Z-Wave device should be purchased by the company because It is a standard for connectivity, used mainly for smart home devices that use the 2.4 GHz RF band and this is also that device which the company wanted for the 50 meters away from the base station.
So, It is a device should be purchased by the company.
Other options are incorrect because those devices not accomplish the following requirements.