Consider the "in-order-issue/in-order-completion" execution sequence shown in Figure 14.13.
a. Identify the most likely reason why I2 could not enter the execute stage until the fourth cycle. Will "in-order issue/out-of-order completion" or "out-of-order issue/out-of-order completion" fix this? If so, which?
b. Identify the reason why I6 could not enter the write stage until the nineth cycle. Will "in order issue/out-of-order completion" or "out-of-order issue/out-of-order completion" fix this? If so, which?

Figure 14.13 An In-Order Issue, In-Order-Completion Execution Sequence

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Write Cycle Decode Execute 12 12 12 I4 I6 I6 I1 13 12 13 I1 12 I5 15 13 15 l6 13 I4 15 16