Final answer:
Natural links are voluntary in nature, indicating that they are created organically without incentives, often signifying the trustworthiness and value of content.
Step-by-step explanation:
The correct statement with regard to natural links is that they are voluntary in nature. Natural links are links that are created organically, without any prompting or incentive. They occur when one website owner decides to link to another website because they find the content valuable or relevant. This means that these links are naturally occurring or earned because someone found the content valuable enough to link to it of their own accord, without any reciprocal arrangement, incentive, or manipulation. Natural links typically do not follow any pattern and can come from any kind of website, including those with .edu or .gov extensions, which tend to be regarded as authoritative due to their affiliation with educational institutions and government entities, respectively.