The correct answer is: "RNA or DNA and a protein coat."
A virus consists of genetic material, which can be either RNA or DNA, and a protein coat, also known as a capsid. The genetic material carries the instructions for viral replication and can be either single-stranded or double-stranded, depending on the type of virus. The protein coat, or capsid, surrounds and protects the genetic material. Additionally, some viruses may have additional structures such as an envelope, which is derived from the host cell's membrane, but this is not a universal feature of all viruses. Enzymes are not a characteristic component of viruses, although some viruses may carry specific enzymes within their structure.