how does it work - multi-invoice from mutli-customers with different delivery channel within one con

We are planning to use Bursting control file to handle the delivery option. 

Although our questions are general, let me use Print New invoice concurrent program as my example.

1) Print New invoice concurrent program generates multi-customers and multi-invoice 

output for a given period of time. (For example : Print New invoice concurrent program 

generate 3 different invoices for 3 different customer A, B and C ). Will Bursting 

control file able to handle able to handle output have mutli-invoice/customer? 

In the other word, will Bursting send 1 email out with all 3 invoices ? or 

it will have 3 different email to each customer and with ONLY 1 invoice per