Final answer:
Common agricultural policies are typically not considered barriers to trade, unlike nontariff barriers and protectionism that can restrict imports through regulations and standards.
Step-by-step explanation:
Restrictive administrative and technical regulations can create barriers to trade in many forms. These can include nontariff barriers, such as licensing requirements, safety, environmental standards, and protectionism policies. Examples of these barriers include antidumping regulations, product size regulations, and safety and health regulations. However, one option listed does not represent a form of trade barrier, which is common agricultural policies. These policies are typically designed to support the agricultural sector within a country rather than act as a trade barrier.