Classify each of the following activities as unit level, batch level, product level, or facility level for a manufacturer of chairs.

$\backslash$table$[[$Activity$,$Level$],[1.$ Preparing machines for assembly,$],[\backslash$table$[[2.$ Cutting and sanding the leg of a$],[$chair$]],],[3.$ Sampling chairs to ensure quality,$],[4.$ Cleaning the factory equipment,$],[\backslash$table$[[5.$ Recycling waste after completed$],[$batch$]],],[6.$ Designing improvements to chair,$]]$