The correct option is D all of the above
DNA replication is the process by which DNA makes a copy of itself during S phase of cell division. From one stand of DNA, a new strand of DNA forms.
Transcription is the process by which the information in a strand of DNA is copied into a new molecule of RNA.
mRNA and tRNA are primarily synthesized from mRNA and tRNA genes through transcription by RNA polymerase from DNA in the nucleus.
Hence, DNA strand is involved in the synthesis of other DNA strand, mRNA and tRNA.