If \( a^{2}+b^{2}-a b-a-b+1 \leq 0, a, b \leq R \), then \( a+b \) ...

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If \( a^{2}+b^{2}-a b-a-b+1 \leq 0, a, b \leq R \), then \( a+b \) is equal to:
(A) 5
(B) 2
(C) 9
(D) 4
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