A genomic DNA possesses functioning units, a group of genes under the influence of promoters known as

The correct option is operons.

In genetics, a functioning unit of genomic DNA containing a cluster of genes under the control of a single promoter is known as an operon.
This genetic regulatory system is primarily found in prokaryotes (such as bacteria) and some viruses, allowing a group of genes with related functions to be transcribed together into a single polycistronic mRNA molecule. This ensures that the cell can efficiently co-regulate the expression of genes that are needed at the same time.

To understand why the other options are incorrect:
• genes: A gene is a single basic unit of heredity that codes for a polypeptide or RNA, rather than a group of multiple genes sharing a single promoter.
• codon: A codon is a sequence of three nucleotides on mRNA that corresponds to a specific amino acid or stop signal during protein synthesis.
• anticodon: An anticodon is a sequence of three nucleotides on a tRNA molecule that is complementary to a codon on an mRNA template.