Perform the indicated matrix operations. If an expression is undefined, explain why. Let C= 12 -31 Find 4C-2E -5 [+] 4 and E= OA. 4C-2E= (Click on the answer box and then select the matrix icon below) B. The expression 4C-2E is undefined because 4C and 2E have different dimensions. OC. The expression 4C-2E is undefined because the number of rows in C is not equal to the number of columns in E. O D. The expression 4C-2E is undefined because E is not a square matrix.