Explanation:

All three statements are correct.

Messenger RNA (mRNA) Vaccines

• Messenger RNA (mRNA) is a type of single-stranded RNA involved in protein synthesis.

• mRNA is made from a DNA template during the process of transcription.

• mRNA vaccines work by introducing a piece of mRNA that corresponds to a viral protein, usually a small piece of a protein found on the virus’s outer membrane.

• By using this mRNA, cells can produce the viral protein.

• As part of a normal immune response, the immune system recognizes that the protein is foreign and produces specialized proteins called antibodies.

• Once produced, antibodies remain in the body, even after the body has rid itself of the pathogen, so that the immune system can quickly respond if exposed again.

• Antibodies help protect the body against infection by recognizing individual viruses or other pathogens, attaching to them, and marking the pathogens for destruction.

• If a person is exposed to a virus after receiving mRNA vaccination for it, antibodies can quickly recognize it, attach to it, and mark it for destruction before it can cause serious illness.

• Individuals who get an mRNA vaccine are not exposed to the virus, nor can they become infected with the virus by the vaccine.

Hence option 3rd is correct.