The correct answer is: C. +5 volts
A DC voltage is a voltage that does not change direction over time. It is typically used to power electronic devices. The most common DC voltage on circuit boards is +5 volts. This voltage is used to power many different types of electronic components, including integrated circuits, microcontrollers, and LEDs.
Option A: -12 volts is a common voltage used in some electronic devices, but it is not as common as +5 volts.
Option B: 0 volts is the voltage that is present when there is no current flowing. It is not a common voltage used in electronic devices.
Option C: +5 volts is the most common DC voltage used on circuit boards. It is used to power many different types of electronic components.
Option D: +12 volts is a common voltage used in some electronic devices, but it is not as common as +5 volts.
Option E: None of the above is the correct answer.