Final Answer:
A job posting might be seen by an employee when accessing the company's internal job board, receiving email notifications about available positions, and encountering targeted advertisements on professional networking platforms.
Step-by-step explanation:
Employees can encounter job postings through various channels within an organization. First, accessing the company's internal job board is a common way for employees to explore potential career opportunities within their own organization. Second, receiving email notifications about available positions is another method, where employees are informed directly about relevant job openings.
Lastly, encountering targeted advertisements on professional networking platforms, such as LinkedIn, is a way for employees to be exposed to external job opportunities aligned with their skills and interests. These examples illustrate different avenues through which employees may come across job postings, whether internally or externally.