Your client operates a multi-department organization and requires precise tracking of cloud infrastructure expenditure to appropriately charge each internal group. What feature should they apply to ensure expenses are attributed correctly for each department's usage?
Merge all departmental accounts into a single payment entity for streamlined billing
Configure spend monitoring tools to send alerts when each department's budget threshold is met
Negotiate reduced pricing for extended commitment from each department
Apply resource labeling with key-value pairs customized to each department