Final answer:
Martha should consult Ubuntu documentation and forums for information on the odd behavior of Ubuntu workstations after ruling out malware, as these are tailored to the specific needs of Ubuntu systems.
Step-by-step explanation:
If Martha has ruled out malware as the cause of the odd behavior on the Ubuntu workstations, she should next consult Ubuntu documentation and forums for further information (Option A). The ubuntu community is known for its robust user documentation, community forums, and support channels dedicated to Ubuntu-specific issues.
Since the problem pertains to a Linux-based operating system, Microsoft support (Option B) is unlikely to be beneficial as it deals with Windows systems. General computer troubleshooting websites (Option C) might offer some help, but they might not have fixes tailored to Ubuntu's particular nuances. Social media (Option D) can sometimes yield anecdotal solutions, but this should not be a primary resource, as the information is not always reliable or applicable to the specific issue.
Consulting Microsoft support would not be suitable in this case because the issue is related to Ubuntu workstations, not Microsoft Windows. While general computer troubleshooting websites can offer some guidance, the Ubuntu documentation and forums specifically cater to Ubuntu-related issues, making them the best sources of information. Social media for user experiences may provide anecdotal insight but is not a reliable source for technical troubleshooting.