Under the General Data Protection Regulation (GDPR), which situation would be LEAST likely to require...

A Data Protection Impact Assessment (DPIA) is a process to help identify and minimize the data protection risks of a project. Under the GDPR, a DPIA is required when the processing is likely to result in a high risk to the rights and freedoms of individuals, especially when using new technologies. The GDPR provides some examples of high-risk processing activities, such as systematic and extensive evaluation of personal aspects, large-scale processing of special categories of data, or systematic monitoring of public areas. The other options are more likely to require a DPIA than the online magazine using a mailing list to send a generic daily digest to marketing emails, as they involve more sensitive or intrusive types of processing. References:

[Data protection impact assessments | ICO]

[Art. 35 GDPR – Data protection impact assessment - GDPR.eu]