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VUI-202012/01. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/vui-20201201/variant-under-investigation-2020-december-1st (Accessed: 21 June 2026).
A performance metric used to evaluate the effectiveness of advertising campaigns by measuring the revenue generated for every unit of money spent on ads. It helps businesses understand whether their\u2026