Which mathematical innovation first allowed retail point-of-sale systems to perform real-time inventory tracking in the 1970s?

The integration of mathematics into retail and point-of-sale systems has transformed how businesses operate. From basic cash registers to sophisticated algorithmic pricing models and predictive analytics, mathematics has become the backbone of modern retail operations. This poll tests your knowledge about a pivotal moment in retail mathematics history that changed how businesses process transactions.

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Relational database algebra, developed by E.F. Codd at IBM
Simplex algorithm optimization, refined by George Dantzig
Bayesian probability networks pioneered by Judea Pearl
Fast Fourier Transform algorithms by James Cooley and John Tukey