What limitation applies to an RFP regarding purchasing commitments?

The correct choice indicates that a Request for Proposal (RFP) serves as an invitation without commitment to purchase. This is essential in the procurement process as it allows organizations to solicit proposals from potential vendors while retaining the flexibility not to enter into a contract with any of the respondents.

The RFP process is designed to gather information about available solutions and pricing, enabling an organization to evaluate and compare offerings from different suppliers. By not committing to a purchase, the issuing entity can ensure that it chooses the best fit for its needs based on the proposals received. This flexibility is crucial because it allows organizations to make informed decisions and adjust their purchasing strategy based on the proposals they receive without being legally bound to finalize a contract.

The other options suggest misconceptions about the nature of RFPs, such as deeming them as binding contracts or guaranteeing vendor selection, which misrepresents the RFP's purpose and the options it provides to organizations during the procurement process.