Final answer:
The correct answer is b) Place the bed board directly on the floor.
Step-by-step explanation:
This guideline is incorrect because a bed board should not be placed directly on the floor. It should be positioned between the mattress and the box spring to provide additional support and stability to the bed.
Placing the bed board directly on the floor would not allow it to serve its intended purpose and may cause discomfort or uneven support.
Therefore, the correct placement of a bed board is to position it between the mattress and the box spring.