With n variables and m fundamental dimensions in a system which one of the following statements relating to the application of the Buckinghams Pi Theorem is incorrect ?

Buckingham's pi theorem is not directly applicable in compressible flow problem

With experience pi terms can be written simply by inspection of variables in a flow system

Buckinghams pi theorem yields dimensionless pi terms given by the difference between the number of variables and the number of fundamental dimensions

Buckinghams pi theorem reduces the number of variables by the number of fundamental dimensions involved.

Declaring variables is advantageous because it

avoids errors from misspelled variable names b) helps the linker work efficiently

simplifies the writing of very short programs

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