Given is the labeled flowsheet for the mixing process in which Fi(1,2and3) are the total molar flow rates Xn^i (i=1,2 and 3)&(n=A and B) are the mole fraction values for A and B in the respective streams. The degree of freedom for the given system is.

F1=100 mol/s

X^1A=0.5

X^1B=0.5

F3=?

X^3A=?

X^3B=?

F2=?

X^2A=0.9

X^2B=0.1

Select one:

a.1

b.2

c.-2

d.-1