A school has 500 students, and B school has 800 students. Among these students there are 30 siblings pairs consisting of 1 A school student and 1 B school student. If 1 student is selected at random from both schools, what is the probability that a sibling pair is selected?

a) 3/40000, b) 3/20000, c) 3/4000, d)9/400, e)6/130