Here's a problem to solve: Which immune system function is carried out by antibodies?

Among the 4 following options, which is the correct answer?

- A: Antibodies produce proteins that attach to an invading virus.
 
- B: Antibodies attach to an invading virus as a target marker.
 
- C: Antibodies engulf the invading virus as a defense mechanism.
 
- D: Antibodies release enzymes that lyse the invading virus.
 