In Meselson and Stahl’s experiments, bacteria were grown in…

In Meselson and Stahl’s experiments, bacteria were grown in a medium containing “heavy” nitrogen (15N) and then transferred them to a medium containing 14N for two rounds of replication.  After the DNA is isolated and centrifuged to separate by weight, which of the figures to the right would be expected if the DNA is replicated by a semiconservative mechanism?