Janine wishes to conduct a poll to predict how many dance club members will vote for her for her club president. which polling method(s) are likely to be biased? select all that are correct.
a. from a list of all club members, 25 members are selected at random and asked whom they intend to vote

b. 5 of janine's friends are selected and asked for whom they intend to vote

c. janine chooses 5 members that plan on voting for her and asks each to select another 5 members. these 25 members are asked for whom they intend to vote

c. every 20th club member from a list of all members is selected and asked for whom the member intends to vote.