Which point-of-sale innovation first allowed music retailers to track inventory and analyze purchasing patterns of physical albums in real-time?

The music retail landscape has transformed dramatically over the decades. From cash registers to sophisticated digital systems, point-of-sale (POS) technology in music stores has evolved to meet changing consumer behaviors and industry needs. This trivia question explores a significant innovation that revolutionized how music products are sold in physical retail environments. Test your knowledge about the intersection of music retail and technology!

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UPC barcode scanning systems (introduced in the early 1980s)
Credit card imprinters (introduced in the 1960s)
RFID tagging systems (introduced in the early 2000s)
Mechanical cash registers with department keys (introduced in the 1950s)