What is the relation between the nozzle A1t and diffuser throat area A2t in the supersonic wind tunnel?

What is the relation between the nozzle A1t and diffuser throat area A

1.	What is the relation between the nozzle A_1t and diffuser throat area A_2t in the supersonic wind tunnel?
A.	A<sub>t2</sub> = A<sub>t1</sub>
B.	A<sub>t2</sub> > A<sub>t1</sub>
C.	A<sub>t2</sub> < A<sub>t1</sub>
D.	A<sub>t2</sub> A<sub>t1</sub> = 1
Answer» C. A<sub>t2</sub> < A<sub>t1</sub>