Send Email Campaign to Contacts that are Customers?

Send Email Campaign to Contacts that are Customers?

I am building a View in Contacts to Sync with Zoho Campaigns to send emails to my customer contacts.  When designing a custom view in the Contacts Module, I don't seem to have Criteria available for Account Type.  I'm unsure how to make a View in Contacts where Account Type = Customer so that I can then sync that view to Campaigns.  Thanks so much!