What are the Cramer’s solutions equated to while using Cramer’s method of classifying a PDE?

The derivatives of dependent variables

The second derivatives of dependent variables

The highest derivatives of dependent variables

What are the Cramer’s solutions equated to while using Cramer’s me

1.	What are the Cramer’s solutions equated to while using Cramer’s method of classifying a PDE?
A.	The dependent variables
B.	The derivatives of dependent variables
C.	The second derivatives of dependent variables
D.	The highest derivatives of dependent variables
Answer» C.