Which statement is true?

a crt is a higher-level respiratory therapy certification.
every crt is also an rrt.
a rrt is a certification that adds a specialization.
every rrt is also a crt.

And the 1 points are for this 20 if i get all 3 of them correctly i will give you brainliest and if you only get all 3 i will give you brainliest including a and the rating will be 5 and if you get those i will give you 20 points