“Hexadecimal uses digits that more closely resemble our usual base-10 counting system and it's therefore easier to decide at a glance how big a number like e7 is as opposed to 11100111. Higher information density. With 2 hexadecimal digits, we can express any number from 0 to 255.”
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.

Difference between first and second generation of computers.

Refer to attachment.!
<h3>Hope It's helped mate! :)</h3>
Identify, gather information, identify any alternatives, weigh the evidence, choose among alternatives, take action, review you decision
The newest android version is nougat.