We live in an era where everything can be measured using some kind of device, and where data are transmitted to live databases running in the background, and huge data sets have become common. $\_\_\_\_\_$ enables knowledge about the status of vehicles, the levels of milk in the fridge, and how long it will take crops to ripen in the field. Smart applications such smartwatches as are increasingly able to count the number of steps people take, their heartbeat and blood pressure, thereby carefully recording such data for future use

a$.$

Wi$-$Fi

b$.$

Sensor

c$.$

Internet

d$.$

Bluetooth