Final answer:
The validity of registration cards issued by a board depends on the board's specific regulations and cannot be accurately determined without additional context.
Step-by-step explanation:
The validity period of registration cards issued by a board can vary depending on the specific regulations of the board in question. Assuming this question pertains to a specific board's licensing or registration processes, you would need to refer to that board's official rules or regulations to find the correct answer. For example, if this is about professional licensing for healthcare workers, engineers, or teachers, the duration of validity could be stated in the governing body's rules. Without more context, it is not possible to definitively answer whether the correct duration is 1, 2, 3, 4, or 5 years.