The conductivity probe measures current flow. It consists of two electrodes: one electrode is positively-biased, and the other is negatively-biased. Which respective directions do cations and anions flow when being measured?

options:

1) Both cations and anions flow to the positive electrode.

2) Both cations and anions flow to the negative electrode.

3) Cations flow to the negative electrode, and anions flow to the positive electrode.