Take a careful look at Fig. 3-13(b). If D asks for one more unit, does this lead to a safe state or an unsafe one? What if the request came from C instead of D?

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Has Max 1 6 1 5 2 4 4 7 Free: 2 (b) Figure 3-13. Three resource allocation states: (a) Safe. (b) Safe. (c) Unsafe. A B C D