1.A community college would like to determine student opinions about a new policy that will require students to buy a parking permit each semester.Which sampling design is the best for avoiding bias? Choose from the designs listed below. [Circle the answer.] [5 pt]

a)Post an announcement on the campus website asking students to email in their opinions.

b)Send an email to 50 students asking them to email in their opinions.

c)Survey every third student who enters the library.

d)Obtain a list of student names from the registrar and select 500 names at random to contact.