Which of the Following Is True When Using Summation Variables

Multiple Choice

Which of the following is true when using summation variables?

A) The number of constraints will stay the same as in a formulation without the use of summation variables.
B) The number of variables will stay the same as in a formulation without the use of summation variables.
C) There are typically fewer non-zero input coefficients on the left side of the constraints.
D) Percentage constraints cannot be formulated without the use of summation variables.