如何在tkinter中使每个单选按钮与众不同

import tkinter as tk

root = tk.Tk()

var = tk.StringVar()

button1 = tk.Radiobutton(root, text="Option 1", variable=var, value="option1")
button2 = tk.Radiobutton(root, text="Option 2", variable=var, value="option2")
button3 = tk.Radiobutton(root, text="Option 3", variable=var, value="option3")

button1.config(font=("Arial", 12), bg="white", activebackground="white")
button2.config(font=("Arial", 12), bg="white", activebackground="white")
button3.config(font=("Arial", 12), bg="white", activebackground="white")

button1.pack()
button2.pack()
button3.pack()

root.mainloop()