3. Use the following code to answer questions: 3a-3c class Student: def _-init--(self, major, id, class "Freshmen"): self.major- major self.id id Self.classclass self.friends] def upgrade (self) self.major"CS def __str.(self) return self.major 3a. [5 pts] Given the Student class from the preceding question. Write the code necessary to create a list of 20 different Students called studentlist who are all "Freshmen" majoring in "ISYE".Give each student a unique id. The id must be an integer 3b. [5 pts] Given the list called studentlist from the preceding question. Write the code necessary to make all of the students in the list whose id is ODD switch their major to "CS" using the upgrade function