Which of the following settings mandatory to fulfil these requirements?

Your customer wants to use a new business activity for capturing trade fair contacts that can be used as follow up documents for leads.

Which of the following settings mandatory to fulfil these requirements? There are 3 correct answers to this question.
A . Define a transaction type for the Trade Fair contacts using a leading business transaction category ‘Business Activity’.
B . Set up Copy control for source transaction type ‘Lead’ and target transaction type ‘Trade fair contact’.
C . Maintain item category determination for the trade fair contact.
D . Implement a BADI for copy control.

Answer: A,B,C