Part $1$: What variables might be used to segment these consumer markets? $($a$)$ smartphones, $($b$)$ frozen pizzas, $($c$)$ breakfast cereals and $($d$)$ soft drinks? Why did you choose these particular variables?

Part $2$: What variables might be used to segment these industrial markets? $($a$)$ cleaning supplies, $($b$)$ photocopiers, $($c$)$ production control systems, and $($d$)$ car rental agencies? Why did you choose these particular variables?