Final answer:
The true statement regarding the nature of the Tao is that it is dynamic and ever-changing, aligning with the Daoist views of a boundless, undefinable source and flow of all existence.
Step-by-step explanation:
When speaking of the nature of the Tao, the following statement is true: The Tao is dynamic and ever-changing. The Daoist philosophy suggests that the Tao represents the underlying connectedness and oneness of everything, being the source or origin of all that exists, including being and non-being, and it remains inexhaustible and unchanging in its essence while the manifestations of it are ever-changing. This is identified through the concept of wu wei, implying a certain spontaneity and nonaction that aligns with the flow of nature. Moreover, attempts to categorize the Tao using language and rational concepts are discouraged by Daoists, as language imposes limits and boundaries that are foreign to the nature of the Tao, which itself is boundless and indefinable. Therefore, Option 2: The Tao is dynamic and ever-changing, is the correct understanding of the nature of the Tao according to Daoist teachings.