_______ es una solución de medición y análisis que proporciona a los anunciantes una forma de medir el impacto agregado y total de sus tácticas publicitarias en las actividades de compra en Amazon.com o en sitios web externos, mientras las campañas están a la mitad del periodo de publicidad.

Omnichannel Metrics is the correct answer because it is specifically designed to provide advertisers with a holistic view of their advertising impact across Amazon.com and external websites, even while campaigns are ongoing. This allows for in-flight optimization and a comprehensive understanding of customer journeys. Amazon Attribution, while a measurement solution, primarily focuses on attributing sales to specific ad touchpoints, not necessarily the aggregated, total impact across all tactics and channels during a campaign. Amazon Brand Lift measures the effectiveness of advertising in increasing brand awareness, ad recall, and other brand-related metrics, rather than the direct impact on purchasing activities across multiple channels.