How would you deploy TE250X Check Point appliance just for email traffic and in-line mode...

To deploy a TE250X Check Point appliance just for email traffic and in-line mode without a Check Point Security Gateway, you can utilize Check Point Cloud Services. In this scenario, you can leverage cloud-based email security services provided by Check Point without the need for an on-premises Security Gateway.

Option C correctly states that you can use only Check Point Cloud Services for this scenario, making it the verified answer.

References: Check Point Certified Security Expert (CCSE) R81 documentation and learning resources.