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Four jobs J1, J2, J3 and J4 are waiting to be run. Their expected run times are 9, 6, 3 and 5 respectively. In order to minimize average response time, the jobs should be run in the order:

(A) J1 J2 J3 J4                (B) J4 J3 J2 J1

(C) J3 J4 J1 J2                (D) J3 J4 J2 J1
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