7. A compiler designer is trying to decide between two code sequences for a particular machine. Based on the hardware implementation, there are three different classes of instructions: class A, class B, and class C, and they require two, three, and one cycles per instruction, respectively. The first sequence has 7 instructions: 3 of A, 2 of B, and 2 of C The second sequence has 9 instructions: 2 of A, 1 of B, and 6 of C (a) Compute the CPU cycles for each sequence. Which sequence is faster? (b) What is the CPI for each sequence?