In a voltage measurement experiment a student discovered that there is an uncertainty of 2.0 volts due to parallax. By reading through the device manual the student found that there is additional uncertainty of 1.0 volts in the measurement due to circuit elements of the device. How much uncertainty the student should write in their voltage measurement?


a. +/- 1.0 volts

b. +/- 2.0 volts

c. +/- 2.2 volts

d. +/- 2.5 volts

e. +/- 3.0 volts