You want to prepare a solution of 0.0010 M from a stock solution of 1.0 M by diluting the stock solution. To do this, you are considering two different options:

1. A one-step dilution in which you use a 1 mL pipette (±0.006 mL) and a 1000 mL volumetric flask (±0.30 mL)
2. A two-step dilution, using a 20 mL pipette (±0.03 mL) and a 1000 mL volumetric flask (±0.30 mL) for the first dilution and a 25 mL pipette (±0.03 mL) and a 500 mL volumetric flask (±0.20 mL) for the second dilution.

Which of these two options leads to the smallest overall error?

The one-step dilution
The two-step dilution
It does not matter: both options lead to exactly the same error