Find the time complexity

Find the time complexity

Find the time complexity of following pseudo code:

func(int n)
    an_v=1
    for (lv=1; lv<=n; lv+=an_v)
        an_v++
        print(“*”)

Options

This problem has only one correct answer

O(n)O(sqrt(n))O(1)
O(log n)

Ans:-  2 

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