The correct answer to this open question is the following.
You forgot to include the options for this question. However, we can answer the following.
The step that would immediately precede a threat of temporary suspension is an official written warning.
When a situation like this happens in the corporate world, the Department of Human Resources has some steps to deal with the situation. After some initial actions have been taken and have not been successful, the Department has to take more strict measures to correct the problem. So after an oral warning that was not taken into consideration by the employee, the step that would immediately precede a threat of temporary suspension is an official written warning so the company keeps the written compromise on the part of the employee to change its attitude and behavior. This document will be kept in the company records for further action.