Using $\_\_\_\_\_,$ a supplier can use radio frequency identification $($RFID$)$ tags on each crate, case, or shipping unit to create a digital shipping list.

a$.$RDS $($radar detection system$)$

b$.$EPOD $($electronic proof of delivery$)$

c$.$PPOD $($physical proof of delivery$)$

d$.$RPS $($radio positioning system$)$