Wordwizard

a. He runs the fastest of any student.
b. He runs the fastest of all students.

c. He runs the fastest of any of our student.
d. He runs the fastest of all of our students.

Which of the above sentences are grammatically correct?
Which are natural?

Many thanks

I don't really like any of them.
I would suggest, "He runs faster than any of the other students".

I agree with Bob.