Linear scaling a voltage by 0.1x
Ideally you want something with a sufficiently high input impedance (DAC has limited current sourcing capability) and a sufficiently low output impedance to suit whatever you are connecting the output to.

Using a resistive divider alone (opt 2) would suit the high input impedance, but would also have a high output impedance. If you were to say use 9k/1k resistors for your potential divider, and connected it to a load of say 50 ohm, you would get almost no voltage out due to loading. If your load is high impedance too, then the loading affect will be minimal and you can stick to just the divider.

If your load is low, then by adding an op-amp with unity gain (opt 4), you buffer the output which will allow you to connect to lower impedance loads without the voltage dropping. You can then choose your resistive divider to be a suitable impedance for your DAC, say 10k total impedance (draws 1mA from the DAC).


Stolen from this question, ignore the part numbers

You would connect the resistive divider with the top to the DAC, the middle to the op-amp, and the bottom to ground. This would give you symmetrical scaling over +/-10V. Your op-amp would need to use +/- supplies to cope with the bipolar nature of the input signal.