Which are true about Trialforce Email Branding?

Which are true about Trialforce Email Branding?
A .  It is available only in Unlimited, Enterprise and Developer Editions
B .  It allows you to modify system-generated emails so that they appear to come from your company rather than from Salesforce.com.
C .  Trialforce Email Branding is automatically enabled for existing partners with Trialforce and when a new partner request Trialforce.
D .  Trialforce Email Branding only applies to users who sign up for your application through Trialforce.

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Answer: B,D