Please choose the correct answer to the question: Male barn swallow birds with symmetrically-shaped wings find mates more quickly than males with asymmetrical wing shapes. Which statement best explains the significance of symmetry in the barn swallow population?

Answer1: Symmetrical wings are attractive to females. Answer2: Symmetrical wings indicate genetic mutations. Answer3: Symmetrical wings indicate that males are good predators. Answer4: Symmetrical wings are signs that a bird is very aggressive.

Answer format: answer1/answer2/answer3/answer4