Is I-29F (K-1) a non-immigrant visa or immigrant? and whats the difference

hello, hope all are well, i am trying to bring my fiance from Kandahar, Afghanistan to the united states so we can marry within 90 days., i was looking to see if the national visa center will transfer the application to the U.S. consulate in Kabul,Afghanistan or the consulate in Islamabad, Pakistan, which one do they send the info too since she lives in Afghanistan? i heard before ,they send it to Islamabad but now Kabul has updated and they take the I-29F forms too, (i think?) , Kabul takes non-immigrant visa, so is the I-29F considered one? PLEASE HELP ...PLEASEEEEEEE,, THANK YOU SO MUCH FOR YOUR TIME...