W$4.$A$3$c$.$ A warehouse company with high volume of incoming and out coming units every day is considering automatization of its identification system of incoming goods. A identification tag is attached to each item and it is not in line of sight.

For automatization purposes, what is the most applicable solution?

$-$Human Readable Labels

$-$Optical Character Recognition $($OCR$)$

$-$Bar Codes

$-$Radio Frequency Identification $($RFID$)$