slope:A wheelchair ramp stair should use a gradient of 1:12, which is not too steep to climb in a wheelchair, but is also not too long. Measure the length between the top of the steps and any nearby walls or other obstacles. Multiply the height of the steps in millimetres by 12 to find the length of the ramp you will need​

the correct option is (d) vin label

vin stands for vehicle information number. this is a thin metallic plate attached to the engine of the vehicle and it includes all the important information which are related to the vehicle. it also provides the information whether the vehicle has been stolen or not because the replacement and alternation of vin number creates difference in the exact number printed on the vin and carved on the engine.