Which passport copies to include in NVC document submission?


I have received the welcome letter from the NVC and finished IV fee payment and DS-260. Next, I need to submit the documents to the NVC and have a few questions -

1) Should I send copies of only the latest passport or all previous (expired) passports?

2) Should I include all pages of the passport(s) including the blank pages?

3) Should the photocopies in color or black and white?

Appreciate your help.