Explanation

Box 1: No
Chat is an engagement channel that is available in Omnichannel for Customer Service. There is thus no need to purchase a third-party ISV solution to use chat in Omnichannel for Customer Service.
Box 2: Yes
SMS is an engagement channel that supports asynchronous mode of communication, and allows your organization to connect to customers by using text messages. The SMS channel is available in Omnichannel for Customer Service.
Box 3: No
Omnichannel for Customer Service is a paid add-on to Dynamics 365 Customer Service apps. It is available only when you purchase a subscription to Chat for Dynamics 365 Customer Service or Dynamics 365 for Digital Messaging.