If f(0) = acos(be) + 1, where a > 0 and b>0, then a true statement is Select one: a. -1 ≤ f(0) ≤1 b. -1≤a≤1 O c. -a +1≤ f(0) ≤a+1 d. -a +1≤e ≤a+1

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