What is the most likely explanation for the dark area in the image below? 
Definitions:
Supervisor
An individual responsible for overseeing and directing the work of others in a professional setting.
Charge Nurse
A registered nurse assigned to manage a specific department or unit within a healthcare facility, overseeing the nursing staff and patient care.
Mentor
A person who offers guidance, advice, and support to another, especially in educational, professional, or personal contexts.
Leadership Qualities
Attributes and behaviors that contribute to the effective guidance and management of groups or organizations.
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