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Math Multiple Choice

For positive integers a and b, let a circle graphic b be defined as ab +1. If x and y are positive integers and x circle graphic y = 16, which of the following could be a value of y?

I. 1
II. 2
III. 3

(A) I only
(B) II only
(C) I and III only
(D) II and III only
(E) I, II, and III