You can create the following Email Template Formats: Choose 4
You can create the following Email Template Formats: Choose 4
The correct email template formats that can be created are Text, Visual Force, HTML with Letterhead, and Custom HTML, because these are standard formats supported by the platform for various email customization needs.
https://help.salesforce.com/articleView?id=email_templates_classic_types.htm&type=5
Text HTML (using Classic Letterhead) Custom (without Classic Letterhead) Visualforce