VIC: Residential Tenancies Act Section 498ZZ What if 2 or more notices can be given?

What if 2 or more notices can be given? 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.