Describe what a parameter is and why it is used in systems of equations with an infinite number of solutions.Choose the correct answer below.
A. Parameters are required when a system has infinitely many solutions. A general solution can be written as a difference between the variables. The variables in this case are called parameters.
B. Parameters are required when a system has no solutions. A general solution can be written as a difference between the variables. The variables in this case are called parameters.
C. Parameters are required when a system has infinitely many solutions. A general solution can be written as an expression in terms of one of the​ variables, where that variable can be any real number. That variable in this case is called a parameter.
D. Parameters are required when a system has no solutions. A general solution can be written as an expression in terms of one of the​ variables, where that variable can be any real number. That variable in this case is called a parameter.