What file contains the controller class for the frontend path /mymodule/custom?

Your module, MyCompany_MyModule, is using the frontName mymodule. You need to locate the class responsible for the frontend path /mymodule/custom.
What file contains the controller class for the frontend path /mymodule/custom?
A. Controller/Custom/Index.php
B. Controller/Custom.php
C. Controller/MyModule/Custom/Index.php
D. Controller/Frontend/MyModule/Custom.php

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