What requirement may the board impose according to the Texas Private Security Act regarding registration?

The correct choice emphasizes the requirement that individuals must hold an endorsement to perform regulated activities as set forth by the Texas Private Security Act. This requirement ensures that individuals are adequately trained and certified to engage in specific activities that fall under regulated security functions. The board has the authority to impose such a regulation to maintain a standard of professionalism and competency within the security industry. This endorsement serves to enhance public safety and protect both consumers and practitioners, making it a crucial component of licensing and registration in the private security sector.

Other options do not align with the requirements established by the Act. For instance, the idea that individuals might be exempt from registration solely based on working part-time does not reflect the board's intention to ensure all practitioners meet certain standards regardless of their employment status. Similarly, the notion that license holders cannot take on additional responsibilities is restrictive and does not necessarily apply to the broader framework of security operations, which often requires adaptability in roles. Lastly, claiming that endorsements are only required for security officers neglects the comprehensive nature of the Act, which mandates certain qualifications across various roles in the security field.