2 1 what kind of immigrant visa should children of American citizens apply for? Thank you~

American immigrant visa 1: relative immigration

There are two kinds of relatives immigrants: one is relatives immigrants who are not limited by the number of immigrants around the world, that is, immediate family members: spouses of American citizens; Minor children of American citizens (2 1 under); Parents of American citizens. This is classified as the closest relative and is available at any time. The other is the relative migration limited by the number of global immigrants, which is divided into four grades according to the priority order:

First priority: adult children of American citizens (over 2 1 year) and their children.

Second priority: 1. Spouses and minor children of permanent residents; Adult unmarried children of permanent residents and their children.

Third priority: married children of American citizens (regardless of age) and their children.

Fourth priority: 2 1 or brothers and sisters of American citizens.