Which right can be exercised by the data subject unless the request is vexatious or unreasonable?

The right that can be exercised by the data subject unless the request is vexatious or unreasonable is the right to correction. This right allows individuals to request the rectification of inaccurate or incomplete personal data held about them. It is rooted in the principle that individuals should have control over their own data, including the ability to ensure that all information is truthful and up-to-date.

When a data subject feels that their personal data is incorrect or misleading, they can appeal to the data controller to make necessary corrections. This is particularly important for preserving data accuracy and integrity, which is a cornerstone of data privacy laws. However, if the request is deemed vexatious (i.e., made with the intention to annoy or harass) or unreasonable, the data controller may have grounds to refuse the request, ensuring that not every inquiry overwhelms the system or seeks to exploit the process without just cause.

In contrast, other rights such as the right to file a complaint, right to erasure, and right to object have different implications and processes associated with them. The right to erasure, while also fundamental, has stricter conditions and is often not as straightforward to exercise as the right to correction.