¿Qué herramienta deberías usar para ver las fuentes donde tu competidor ha publicado anuncios de display?

The correct answer is "Publicidad de display" (Display Advertising) because this Semrush tool is specifically designed to analyze competitors' display ad campaigns. It provides insights into where competitors are running display ads, their ad creatives, and their publishers. "Investigación de la publicidad → Textos de anuncios" (Advertising Research → Ad Copies) focuses on text ads in search results, not display ads. "No es posible hacerlo" (It's not possible) is incorrect as Semrush offers this functionality. "Historial de anuncios de palabras clave" (Keyword Ad History) tracks historical performance of keyword-based ads, not display ads. "Keyword Magic Tool" and "PPC Keyword Tool" are used for keyword research and PPC campaign planning, not for analyzing competitor display ad placements.