A physical therapist checks the water temperature of the hot pack machine after several patients report the heat being very strong. Which of the following temperatures would be acceptable?
 
1.      64 degrees Celsius (147 degrees Fahrenheit)
2.      71 degrees Celsius (160 degrees Fahrenheit)
3.      83 degrees Celsius (181 degrees Fahrenheit)
4.      94 degrees Celsius (201 degrees Fahrenheit)

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