Please choose the correct answer to the question: In fruit flies, red eyes are dominant over sepia eyes. A male with red eyes is crossed with a female with sepia eyes producing first generation offspring that all had sepia eyes. What does this indicate about the flies that were crossed?

Answer1: Both parents are homozygous for the trait. Answer2: Both parents are heterozygous for the trait. Answer3: The male is heterozygous and the female is homozygous recessive for the trait. Answer4: The male is homozygous dominant and the female is heterozygous for the trait.

Answer format: answer1/answer2/answer3/answer4