¿Cuál de los siguientes tipos de acuerdos es un arreglo prenegociado solo por invitación entre un editor y un anunciante?

Programmatic Guaranteed (PG) is the correct answer because it represents a pre-negotiated, invitation-only agreement between a publisher and an advertiser for a guaranteed volume of impressions at a fixed price. This ensures premium inventory for the advertiser and guaranteed revenue for the publisher. Preferred Deal is incorrect because while it's also invitation-only and pre-negotiated, it does not guarantee impression volume; the advertiser has the first right of refusal but isn't obligated to buy. Private Auction is incorrect because it's an invitation-only real-time bidding environment where multiple advertisers compete, meaning prices are not fixed and impressions are not guaranteed.