Which of the following is a required disclosure in a mortgage broker's business history?

A required disclosure in a mortgage broker's business history is an administrative order by a state authority. This is significant because it relates directly to the regulatory oversight of mortgage brokers and ensures transparency in their operations. If a broker has been subject to an administrative order—such as a sanction or enforcement action—it is crucial for potential clients and business partners to be aware of this information.

This disclosure helps maintain accountability and trust within the mortgage industry, as it informs stakeholders about the broker's compliance with laws and regulations. Understanding a mortgage broker's regulatory history assists consumers in making informed decisions regarding their financial transactions and selecting a trustworthy professional.

The other options, while potentially informative, do not hold the same weight in terms of mandatory disclosure. For instance, past employment details, annual income, and past marketing strategies do not inherently reflect the broker's regulatory standing or any compliance issues that could affect a client's experience or the safety of their investments.