Segmentation Delta Infoset

Dear All,

Currently we are implementing HV segmentation and i need help in understanding few fields while configuring infoset....

I am using infoset "CRM_MKTHV_PERS_CENTRAL" and i see a field BP category with person, group, Org options.. whats the need of it and which one needs to be selected for infoset CRM_MKTHV_PERS_CENTRAL ?

2) Also , how different is Delta infoset / Source ID which we select below..? how does this selection help in delta loading..., currently when i select source ID , i get below error...am i missing any config??

Thanks in Advance for your inputs..

Best Regards,

Sweta