Assertion (A): In a supersonic nozzle, with sonic condition at the throat, any reduction of downstream pressure will not be felt at the inlet of the nozzle.
Reason (R): The disturbance caused downstream of supersonic flows travels at sonic velocity which cannot propagate upstream by Mach number.
a. Both A and R are individually true and R is the correct explanation of A
b. Both A and R are individually true but R is not the correct explanation of A
c. A is true but R is false
d. A is false but R is true