From which part of the Code of Ethics does the line about the highest and best use of land originate?

The line about the highest and best use of land originates from the preamble of the Code of Ethics. The preamble serves as an introductory statement that sets the ethical tone for real estate professionals, emphasizing principles such as professionalism, honesty, and integrity in all dealings. This foundational aspect of the Code highlights the importance of understanding land use in the context of providing accurate and ethical real estate advice. The preamble's focus on the ethical responsibility of agents aligns closely with the idea of serving clients by maximizing the value and use of property, which is encapsulated in the concept of the highest and best use.

In contrast, the other options, such as Articles 1, 3, and 13, address specific duties and responsibilities that real estate professionals have towards their clients and the public, but they do not directly reference the concept of the highest and best use in the same foundational manner as the preamble.