Your client wants to start collecting first-party data. Which two Google tagging infrastructures can help them build durable first-party data?

Consent Mode and site-wide tagging are crucial for building durable first-party data. Consent Mode adjusts how Google tags behave based on user consent, ensuring data collection respects privacy choices while still allowing for modeling of lost conversions. Site-wide tagging, implemented via the Google tag (gtag.js) or Google Tag Manager, ensures comprehensive data collection across all pages of a website. This consistent and complete data capture is foundational for robust first-party datasets. Firestack is not a Google tagging infrastructure; it's a term sometimes used for a Firebase/Firestore/React stack. Engaged Conversions is a metric, not a tagging infrastructure.