Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to use a sleep number bed [title] Use a platform or board frame for the bed. [step] The base of the bed must be firm and solid so the mattress is well supported. Avoid using a traditional box spring or a slatted bed frame as they will not be supportive enough.

Ending1: Instead, make sure the front or back of the bed frame is supported. [title] As for the slide on top, top only supports the bed. Ending2: [substeps] Use pillows and cushions if you can to bring a feel to the style of the bed. [title] Select a platform or board frame to place the bed on. Ending3: Make sure the platform or board frame is big enough to fit the mattress and is at the ideal height for you. [substeps] If you do not want to have to worry about finding the right frame for the mattress, you can buy a base for the bed when you buy the mattress at an extra charge. Ending4: [title] Purchase a bed rail for the base. [step] The platform at the base should be the height that the foot of the mattress is at.

Answer format: ending1/ending2/ending3/ending4