正在准备给父母申请绿卡, I-130/I-485 concurrent filing. 在填写485时遇到一个问题， 想请教一下。
Part 2. Application Type
应该选择 a 还是 h 呢？
a. An immigrant peition giving me an immediately availabe immigrant visa number that has been approved...
or
h. Other basis of eligibility. Explain...
请指教！ 非常感谢！