The electronic circuit below needs at least 3.3 V at Vdd to operate. The main power supply is a 5-V source and the backup is a 3.7 V Li-ion battery. Assume the diodes are Schottky diodes. Now imagine that the voltage of the 5-V source start to drop. At what source voltage will the backup battery begin to supply power?
A. 3.3V
B. 4.3V
C. 4.8V
D. 3.7V
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