Final answer:
To expedite user access in Marketing Cloud for expanding global marketing efforts, the administrator can C) assign Administration User permissions to individual users and to the Channel Manager role, enabling decentralized management and quicker turnaround.
Step-by-step explanation:
In order to speed up the turnaround of granting new users access to the Marketing Cloud when a company is expanding its global marketing efforts, the Marketing Cloud Administrator can consider two approaches.
Firstly, one can assign Administration User permissions to individual users. This allows those users to manage user accounts within their respective business units, thus decentralizing the task and reducing the burden on the central administrator.
Secondly, the administrator could assign Administration User permissions to the Channel Manager role. Channel Managers often need to oversee campaigns and users within their channels, so providing them with these permissions can help streamline user management.