Final answer:
The most helpful action to take would be to directly talk to the coworker and positively collaborate with the team, whereas the least effective method might be purely being nice without any constructive dialogue.
Step-by-step explanation:
Dealing with a coworker's negative attitude in a professional environment requires a balanced approach that includes addressing the issue, providing support, and encouraging a positive work culture. Among the options provided, the most likely action I would take is to talk to your coworker about how her attitude is influencing others. During this conversation, it's important to remain respectful, listen to their side of the story, and offer possible solutions to improve the situation. Alongside this direct approach, I would also collaborate with coworkers to make the work environment more positive and inclusive, which can counteract the negativity.
On the other hand, the least likely action I would take is to simply go out of your way to be nice without addressing the negative behavior. While being supportive is essential, if not coupled with constructive feedback, it might not lead to any significant change. Lastly, involving a supervisor should be a last resort, after attempts to resolve the issue among peers have been exhausted.
It is also essential to maintain a strong, positive relationship with your manager to facilitate a collaborative and supportive work environment. Understanding your manager's priorities, providing exceptional service, and being proactive with the organization's goals can enhance your career growth and satisfaction.