What is the purpose of Custodian Manager?

to submit the details of custodians and custodian groups for which a user wants to search when the user conducts a Discovery Accelerator search

to manage Roles-Based Administration within the Vault Administration Console

to submit the details of custodians and custodian groups for which a user wants to search when the user conducts a Compliance Accelerator search

to manage Client Access for eDiscovery custodian groups