Answer:
All the given options are examples of constraints that could be included in a nurse scheduling problem. Therefore, the correct answer is:
All are examples of constraints that could be included in a nurse scheduling problem.
In nurse scheduling problems, constraints may include ensuring that available nursing hours meet patient care hour minimums (Option 1), accommodating staff preferences for shifts and days on/days off schedules as much as possible (Option 2), and aiming to make shifts scheduled for the nurses as predictable as possible (Option 3). These constraints are crucial for effective nurse scheduling to ensure adequate coverage, staff satisfaction, and patient care quality.