If Option Strict is set to On, which of the following statements assigns the sum of two

Question:

If Option Strict is set to On, which of the following statements assigns the sum of two Integer variables to the Text property of the lblTotal control?
a. lblTotal.Text = (intN1 + intN2).ToString
b. lblTotal.Text = intN1.ToString + intN2.ToString
c. lblTotal.Text = intN1 + intN2.ToString
d. lblTotal.Text = ToString(intN1 + intN2)

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