A leading automobile company has an in-house gear manufacturing plant. Which reason could lead to a short-term schedule disruption of the plant?

While planned holidays may reduce workforce availability, they are typically scheduled in advance and accounted for in production planning. As a result, these holidays do not usually cause unexpected disruptions in the short term, as management can adjust schedules accordingly.

Ongoing construction of new units is usually planned and scheduled, allowing for minimal disruption to existing operations. While it may cause some temporary adjustments in workflow, it is not an unexpected event that would lead to immediate short-term disruptions in the same way a machine breakdown would.

Customer quality expectations influence production standards and processes but do not cause direct schedule disruptions. Instead, they guide operational improvements to meet demand; any changes made for quality reasons would generally be implemented in a planned manner rather than causing short-term interruptions.