What does it mean that DNA replication is a semiconservative process?

The replicated DNA will contain two totally new DNA strands.
The replicated DNA will only be half the same nucleotide order as the parent DNA.
Only the top strand is used for DNA replication
The replicated DNA will contain one strand from the parent the original DNA and one new strand.

The correct answer is: The replicated DNA will contain one strand from the parent/original DNA and one new strand.