Determine if the statement is true or false, and justify your answer.
a. Every matrix A has a determinant.
b. Every nonsquare matrix has a determinant, but square matrices do not.
c. Every square matrix has a determinant, but nonsquare matrices do not.
d. If every entry in a matrix is zero, then the determinant is undefined.
e. If every entry in a matrix is one, then the determinant is undefined.