Which type of DNA is referred to as genomic DNA?

Genomic DNA refers specifically to the chromosomal DNA that constitutes the complete set of genetic material in an organism. This includes all the genes and regulatory elements necessary for the growth, development, and functioning of that organism. Genomic DNA is organized within the chromosomes located in the nucleus of eukaryotic cells, and it represents the entirety of an organism's inherited genetic information.

The other options do not adequately describe genomic DNA. For instance, while plasmids are small circular DNA molecules found in some organisms like bacteria, they are considered extrachromosomal and do not form part of the organism's main genomic DNA. Mitochondrial DNA, while important for cellular functions, is a separate entity and does not encompass the entire genomic representation of an organism. Lastly, DNA used exclusively in cloning might refer to various types of DNA and does not align with the definition of genomic DNA, which specifically indicates the chromosomal DNA that makes up the complete genome. Thus, the correct answer highlights the fundamental component of an organism's genetic architecture.