Which statement is true regarding valid timestamps in logs?

The correct statement regarding valid timestamps in logs is that they can include various separators. This means that the formatting of timestamps is flexible to some extent, allowing for different characters such as dashes, slashes, colons, and spaces to be used to separate components of the date and time. This flexibility is important because different logging systems or applications may use various conventions, and as long as the timestamp remains interpretable by the system reading the log, it can employ diverse separators.

In contrast, while UTC is a widely accepted standard for timestamps, it is not the only format that can be used; hence the option that suggests timestamps can only be in UTC is too restrictive. Additionally, timestamps do not necessarily have to be in ISO 8601 format, even though it is a commonly recommended format due to its clarity and universality. This allows for various timestamp formats as long as they meet the logging system's parsing requirements. Lastly, timestamps are not exclusive to JSON files; they can be found in numerous log formats across different technologies, reinforcing that this categorization does not hold.