Final answer:
In the context of digital platforms, the 'share' or 'share_with' method is typically used to assign content to a group. Terminology can vary, but 'share' is widely used for this purpose.
Step-by-step explanation:
The method used to assign content to a group in the context of computer applications or digital platforms is typically the share or share_with method. The actual terminology can vary depending on the specific application or platform, but 'share' is a common verb used to denote the action of making content available to other users or groups. The method register might be used in a different context, such as signing up for access to a system or service. Similarly, reassign_to is likely to refer to changing the assigned ownership or responsibility for something, rather than sharing content.