These are typically some such concerns for which an advertiser wants reply though determining for an agency. But there's no standardized course of action and conditions to workout the agency appropriateness and make a selection final decision. "Advertiser" could also refer to the entity which is paying for advertising https://penzila.tumblr.com/post/649727237991661568/kuinka-tunnistaa-hyv%C3%A4-mainostoimisto