Before we provide information on how you can ascertain the answer to this question, we must stress on the fact that unfortunately, Adeo are not legal experts. Hence, we cannot offer you guidance on your privacy policies or GDPR compliance queries. However having said that, we have mentioned the following links to guides that can aid your legal teams:
Google Analytics
https://developers.google.com/analytics/devguides/collection/analyticsjs/cookie-usage
WordPress
https://wordpress.org/support/article/cookies/
MailChimp:
https://mailchimp.com/help/additional-tracking-options-for-campaigns/
https://developers.facebook.com/docs/privacy/
Privacy Policy Generator