In the working set model, for : 2 6 1 5 7 7 7 7 5 1 6 2 3 4 1 2 3 4 4 4 3 4 3 4 4 4 1 3 2 3 if DELTA = 10, then the working set at time t1 (….7 5 1) is :

• A. {1, 2, 4, 5, 6}
• B. {2, 1, 6, 7, 3}
• C. {1, 6, 5, 7, 2}
• D. {1, 2, 3, 4, 5}