In solving a linear programming minimization problem using

the simplex method

Select one:

a$.$ every time a surplus variable is added, an artificial

variable must be subtracted.

b$.$ every time an artificial variable is added, a surplus

variable must be subtracted.

c$.$ every time a surplus variable is subtracted, an

artificial variable must be added.

d$.$ every time a surplus variable is added, an artificial

variable must be added.