Assume v1 = IntVar(), how do you create a check button under parent fr

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Assume v1 = IntVar(), how do you create a check button under parent frame1 with variable bound to v1?

A. Checkbutton(frame1, text = “Bold”, command = processCheckbutton)
B. Checkbutton(frame1, text = “Bold”, variable = v1.get())
C. Checkbutton(frame1, text = “Bold”, variable = v1, command = processCheckbutton)
D. Checkbutton(frame1, text = “Bold”, variable = v1.set(), command = processCheckbutton)