As the buyer is involved in creating request for proposals (RFP. for an infrastructure project, they will provide these to sellers of services. All of the following are names used for a seller except?

Contractor is a standard term for a seller who provides services or deliverables under a contract.

Service provider is a commonly used term for a seller that delivers services rather than physical goods.

Supplier is a recognized term for a seller who provides materials, products, or services to the buyer.

The 'acquiring organization' is the entity that is purchasing or acquiring goods and services, making it a buyer-side term, not a seller-side term. The buyer in a contract is the party issuing the RFP and selecting a vendor. Contractor, service provider, and supplier are all recognized PMBOK terms that describe the seller - the party providing goods or services in response to an RFP.