Final answer:
The 30-year-old working professional with a permanent residence cannot meet the residence test for being a qualifying child of another taxpayer.
Step-by-step explanation:
The individual who cannot meet the residence test for being a qualifying child of another taxpayer is the 30-year-old working professional with a permanent residence. In order to qualify as a dependent, a child must meet certain criteria, one of which is the residency test.
The 30-year-old working professional already has a permanent residence, which means they are not living with another taxpayer and therefore cannot meet the residence test.