LexA Protein Is Cleaved When Increased Quantities of Single Stranded

LexA protein is cleaved when increased quantities of single stranded DNA are detected by the RecA protein complex.What circumstances might culminate in LexA cleavage and SOS response induction? (Select all that apply)

A) damage by UV light
B) damge by gamma radiation
C) mutations in DNA polymerase which decrease its rate of DNA synthesis
D) transposon activity
E) plasmid acquisition