Select all scenarios that will not result in a representative sample. Group of answer choices A teacher picks the students in the front row to participate. A teacher picks every third student to participate. A teacher randomly picks the students in the 2nd and 4th row of desks. The teacher divides the students into age groups and randomly selects 5 students from each age group. The teacher assigns a number to each student, then uses a random number generator to select 20 students to be in the sample. Students decide to be in the sample