Following are certain statements related to eukaryotic DNA replication:

A. The genome of multicellular animals contain many potential origins of replication.

B. During early development, when embryos are undergoing rapid cell divisions, origin sites are uniformly activated.

C. "Pulse-chase" technique is used to label sites of DNA replication.

D. The rate of elongation of different DNA chains during genome replication varies drastically.

Which one of the following combinations of above statements is correct?