What Role Does Integration Host Factor (IHF)play in Site-Specific Recombination $\lambda$

Multiple Choice

What role does integration host factor (IHF) play in site-specific recombination during phage $\lambda$ lysogeny?

A) binds host DNA forcing a 90 ^$\circ$ bend
B) supercoils phage DNA
C) cleaves host and phage DNA at specific sites to create sticky ends
D) ligates host and phage DNA once recombination occurs
E) all of the above