Security on custom activity per business unit

Hi,

If I create a custom activity, lets say SMS, and I have multiple business units, Business Unit A and Business Unit B.

If only Business Unit A and not  Business Unit B be able to create an SMS activity, is there an out of the box way to not even show SMS activity when users in Business Unit B uses CRM?

I know you can set permissions on Business Units as well as on custom entities, but I don't know about custom activities.