I-134 affidavit of support

[S and S always 0]

So I am preparing to fill out my I-134 (still have a while until i need to send it to my fiance for his interview) and on number 1 letter b applies to me:

"If a US citien through parents or marriage give certificate of citizenship number"

so my question is, where do I find this on my certificate of citizenship? Because their are two numbers on it (one is in red and the other isn't)

The red one is formatted like this AXXXXXXX (the x's are numbers, their are 7 of them).

My second question is about number 9: "If i have previously submitted affidavit of supports.."

For this question I wrote in my two uncle's that I was a joint sponsor for last year in 2010 for their I-864 Affidavit of Support. They have been through the interview stage and are now waiting for their visa's.

So my second question is, so I still write their names in this section even if I was a joint sponsor for them and even if it was an I-864 not an I-134?

Also, if I do put their names here will if delay or affect my K-1 fiance visa petition in any way?

thank you guys.