Which of the following is NOT an authorized exception to full and open competition?

Full and open competition is a fundamental principle in government contracting aimed at ensuring that all potential suppliers have an equitable opportunity to compete for contracts. However, there are certain exceptions where full and open competition may not apply.

The correct answer identifies "Preference for large businesses" as not being an authorized exception. In fact, federal procurement regulations emphasize that competition should be as inclusive as possible and not unduly favor any specific group, including larger businesses. The goal is to facilitate fair competition, which includes allowing small businesses participation.

In contrast, authorized exceptions like "Only one responsible source," "Public interest," and "National security" are well recognized in government contracting regulations. For instance, there may be cases where only one supplier can meet specific requirements (only one responsible source) or situations where contracting without full competition is necessary to protect national security or serve the public good. These exceptions follow specific regulations and justifications laid out in the Federal Acquisition Regulation (FAR).

Thus, the preference for large businesses does not align with these authorized exceptions, reinforcing why it is the correct answer in this context.