To answer this question, the user needs to understand the purpose of QA in software development and the importance of logging off during deployment.

Option A is not correct because QA's log off does not impact software upgrades deployment time.

Option B is the correct answer. QA should log off during deployment because the deployment process involves updating the software to a new version. If QA is still testing the current code version while the deployment is in progress, they may inadvertently test the wrong version of the code, leading to inaccurate results and errors.

Option C is also correct and provides a more specific explanation of why QA should log off during deployment.

Option D is not correct because lunch breaks are unrelated to deployment or QA.

Therefore, the correct answer is:

The Answer is: B. Impact software upgrades deployment time & no longer testing current code version.