Which two actions can limit Chatter access to a subset of Salesforce users?

Enabling Chatter access for a specific subset of Salesforce users can be achieved through profile settings or permission sets, which allows for granular control over features available to different user groups.

Editing a profile to "Enable Chatter" directly assigns the Chatter feature to users associated with that profile. This means that all users assigned to this profile will have access to Chatter, effectively limiting the feature to only those users. This action provides a straightforward method to control who can use Chatter based on organizational roles or functions.

In contrast, while the other options relate to user access and engagement with Chatter, they are not effective methods to limit access specifically. Inviting users via email doesn't restrict access but rather encourages participation, adding more users to a Chatter environment. Placing users in a company-wide Chatter group also opens access to all users included in the group, rather than limiting it to a specific subset. Moreover, creating a Permission Set to enable Chatter would also allow access to the users assigned that Permission Set, which may surpass the intended subset if not managed carefully.

Therefore, editing a profile to enable Chatter is a precise way to manage access to this feature for a specific group, making it the correct choice for limiting Chatter access effectively