According to federal law, which of the following pieces of legislation addressing illegal immigration would state governments be prohibited from enacting?
a.
an arizona bill that allocates more money to local law enforcement to combat illegal immigration.
b.
an oregon law that increases the minimum prison sentence for illegal immigrants above the federal minimum.
c.
a florida measure appealing to the federal government for more coast guard personnel to curb illegal immigration along the gulf.
d.
a colorado law requiring all businesses operating in the state to provide proof that their employees have social security numbers or valid visas.