VIC: Residential Tenancies Act Section 142ZU What if 2 or more notices can be served?

What if 2 or more notices can be served? If a person is or becomes entitled to give 2 or more notices of intention to vacate or notices to vacate under this Division—

(a) the invalidity of any of the notices does not affect the validity of any other notice; and (b) each valid notice has full force and effect.