AWS services offer pay$-$as$-$you$-$go pricing, so you pay for only what you use each month. Each AWS service has its own pricing model. Which among the below list of tools can be used to evaluate the expenses of operating a web application on AWS with a conventional hosting environment $?$

AWS Cost Explorer

AUNS Budgets

AWS Cost and Usage report

AWS Total Cost of Ownership $($TCO$)$ Calculator