What two aspects are essential in determining an employee's motivation according to the provided concepts?

Determining an employee's motivation is fundamentally linked to understanding their needs and the belief system regarding their potential. The correct pairing of strength of the need with Theory Y captures the essence of a more positive and empowering perspective on motivation.

Theory Y posits that employees are inherently motivated to work and will seek out more responsibility and exhibit self-direction when they are committed to the goals of the organization. This is essential to motivation, as it suggests that when employees' needs are met, they are more likely to be engaged and productive in their roles.

In conjunction, the strength of the need refers to how intense an individual's desire is for achievement, respect, or other fulfilling factors. When these needs are strong and supported by a Theory Y environment, individuals are generally more motivated and willing to contribute positively to the organization.

Other choices may reflect important concepts related to workplace dynamics, but they do not encompass the fundamental correlation between the specific needs of employees and a positive view of their potential as leaders and contributors within the workspace, which is critical for motivation.