Which of the Following Is True of Push Polls

Which of the following is true of push polls?

A) They have been determined to be illegal in twenty-three states.
B) They are always conducted face to face rather than by telephone.
C) They are so controversial that very few candidates have chosen to use them.
D) They were used widely in the 1960s and 1970s, but when they became associated with the dirty politics of those eras, they were disregarded by most candidates.
E) They are designed to disseminate negative information about a candidate.