Let LER dxd be a lower triangular matrix, and let berd be a vector. What is the computational cost of solving Lx=b for x using forward substitution when d=13? O a. Linear systems with lower triangular matrices cannot be solved by forward substitution. O b. Since L is lower triangular, no work is needed to solve the system. The solution can be read off the diagonal of L. O c. 13 flops d. 169 flops O e. 182 flops O f. 732 flops g. 1099 flops Oh. 1100 flops O i. 2197 flops O j. 2210 flops

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