本人（主申请人）情况：EB2 perm based, 140 过了， 现在和spouse （副申请人）一起file 485.
因为spouse非大陆出生, 不用排期，希望用 Cross-Chargeability。
现在，填485 关于Part 2. Application type有一问题：
[a] An immigrant petition giving me an immediately available immigrant visa number that has been approved
[b] My spouse or parent applied for adjustment of status or was granted lawful permanent residence in an immigrant visa category that allows derivative status for spouses and children
请问：
1. 主申请人应该选a吗？
2. 副申请人应该选b吗？