Which of These Is Required for First Strand Invasion in the Double-Strand

Multiple Choice

Which of these is required for first strand invasion in the double-strand break repair model?

A) blunt end double strand break on two sister chromatids
B) 3' single strand tails on one sister chromatid
C) 3' single strand tails on both sister chromatids
D) 5' single strand tails on one sister chromatid
E) 5' single strand tails on both sister chromatids