Data is only _____ if it is current and up to date.

The correct choice is relevant, as data retains its value and usefulness primarily when it is current and up to date. Relevance in this context means that the information is applicable and aligned with the present situation or context in which it is needed. If data is not updated, it can become outdated and may not accurately represent the current state of affairs, leading to potentially misleading conclusions or decisions.

When considering the other options, secure refers to the protection of data from unauthorized access or breaches, and it doesn't necessarily depend on its timeliness. Accessible pertains to how easily data can be obtained or retrieved, regardless of its current condition. Stable indicates that the data is consistent and unchanging over time, which also does not imply anything about its currency. Therefore, relevance is the most fitting term when referring to the importance of having current and up-to-date information.