Assume that Vs = 21 V. Determine the range of voltages Vo that can be measured between the wiper and the negative terminal of Vs. A. 5.2 V ≤ Vo ≤ 15.4 V B. 5.2 V ≤ Vo ≤ 18 V C. 7 V ≤ Vo ≤ 18 V D. 7 V ≤ Vo ≤ 15.4 V E. 3.6 V ≤ Vo ≤ 19 V F. None of the other answers is correct.