Where to mail the forms?

Quick question- On the I-130- Question 14- it asks for an I-94 number and the date of arrival. Should this be the latest I-94 number or the first one that my wife came on?
 
Hi-Thanks for the reply. I-485 asks for the latest entry, but I-130 asks-has your relative ever been in the US and then asks for the I-94 info. So it is not clear that they are asking for the latest I-94.

Can you please comment?
Thanks
 
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