Final answer:
The activity not recommended for an independent SQA group is serving as the sole test team for any software produced.
Step-by-step explanation:
The activity that is not recommended to be performed by an independent SQA group is Serve as the sole test team for any software produced. This is because independent SQA teams are responsible for verifying the compliance of software engineering activities, reporting any evidence of noncompliance to senior management, and preparing SQA plans for projects. However, being the sole test team for software produced can create a conflict of interest and compromise the independence of the SQA group.