Im purchasing a house that is made with concrete block and stucco.
it has an addition in the rear, made of additional concrete block and stucco. But the original exterior, now interior wall is still as it was - covered by stucco and green in color like the rest of the house exterior.
obvously i would like to convert this exterior wall to an interior wall now, and make it white and look like the rest of the drywall-covered walls in the house.

what is the best way to do this?

1) build a 2X4 framing up against the concrete block and hange drywall?

2) use a vapor shield and hang the drywall

3) just use drywall mud to plaster over the stucco texture and then paint it white?

i would like to go with option 3, but i dont know if that will work well or not.

thanks for any input on this.