Explanation:

- A chance witness is someone who unexpectedly happens to be at the scene of an incident. Courts usually view them with suspicion and may check their credibility.

- An interested witness is someone who may personally benefit from the outcome of the case. Their relationship to parties involved is a crucial factor when assessing their reliability.

- A natural witness is someone who was present at the scene naturally or in the normal course of events. The relationship may not always affect their credibility if their presence is justified.

- An inimical witness is someone who is hostile or has enmity towards the accused. Their relationship is significant and often scrutinized.

Correct Answer: Option:3 - Natural Witness

For a natural witness, the relationship is generally not a major factor in assessing credibility, as their presence is expected on natural grounds.