A group of college DJs surveyed students to find out what music to plan for their upcoming parties. Thirty percent of the students preferred dubstep, 25% of the students liked trance music, and 20% wanted to hear only house music. Fifteen percent of the respondents selected both dubstep and trance. The proportion of students that preferred either dubstep or trance is calculated by: None of the answer options are correct. O P(A) + P(B) - P( A and B). O P(A) + P(B) + PCA and B). O P(A) + P(B)