I-864 affidavit of support

[August Boon]

hi, i recently received an email from NVC to instruct me to resubmit some of the documents, but I'm not sure one of the checklist

[x] Please include a photocopy of the principal applicant's I-864 and I-864A (if applicable) for each accompanying dependent listed in Part 3 of the I-864 and Part 2 of the I-864A (if applicable). You do not need to send copies of supporting documents for your accompanying dependents.

can i know what is the meaning above? what photocopy are NVC refer to and how many copies do i need?

thanks in advance