Regarding the socio-economic characteristics of today's US immigrants, which of the following statement is correct? On average the second-generation immigrants cost more than they contribute in taxes, mainly because they tend to be low eaming and have dependents who require public education Undocumented immigrants are free riders who use welfare but never contributed to the Social Secunty system All immigrants are concentrated in low income jobs Coftmpared to native-bom Amencans, immigrants tend to have lower education levels, lower income, and lower levels of health insurance