Find the partial derivative of ( α kₜrho -1 rho² [(α kₜrho) + (1-α)]rho -1 ) with respect to ( kₜ ).
a) ( α rho² (rho - 1) [(α kₜrho) + (1-α)]rho - 2 )
b) ( α rho (rho - 1) [(α kₜrho) + (1-α)]rho - 2 )
c) ( α rho² [(α kₜrho) + (1-α)]rho - 2 )
d) ( α (rho - 1) [(α kₜrho) + (1-α)]rho - 2 )
