In which document type does the costumer often request a detailed quote along with conditions related to service?

The correct choice is a Request for Quotation (RFQ). This document type is specifically designed for soliciting detailed price quotes from suppliers or service providers. When a customer issues an RFQ, they typically outline the specific products or services they need, along with any conditions that must be adhered to, such as delivery timelines, payment terms, or quality specifications. The goal is to receive bidder responses that include not only pricing information but also details relevant to the overall proposal, ensuring the customer can compare offers effectively.

In contrast, an Invitation for Bids (IFB) is more formal and appropriate when seeking competitive bids for large projects, typically involving a specified contract in which costs are just one factor, alongside compliance with specific regulations. A Request for Information (RFI) is used to gather general information from potential suppliers about their capabilities rather than formal price quotes or conditions. An Informally Solicited Proposal does not carry the same structured requirements as an RFQ and often begins with less formal communication, lacking the rigor seen in an RFQ.