Referring to the given figure, what appears to be wrong, if anything, with the D/A converter and what should be done to correct the problem?

• There is nothing wrong with the converter.
• There is an offset error; if no provision is made for adjusting the offset, the op-amp may need to be changed.
• There is a nonlinearity error; the op-amp must be changed.
• The power supply voltage appears to be too high; adjust the power supply to the correct value.