Find all students that do not have a specific GPA

Question | Sep 14, 2016 | hkumar 

These are some sample records in a mongoDB collection students:

{ _id: 1, name: "Bob Lee", gpa: 3.2 }
{ _id: 2, name: "Jia Zun" }
{ _id: 3, name: "Jim Martell", gpa: 3.0 }

Some students do not have GPA as they are recently admitted.

We need to write a query to search all the students that have GPA not equal to 3.0. Note that we do not want those records that have null GPA. Select all the correct choices from below: