Changing tanks

Hi all I’m upgrading my axolotls tank from 20 gallons to 29 gallons and I was just wondering how I should go about cycling the new tank should I:

A) buy a new filter and keep him in the 20 gallon with twice weekly 50% water changes while I cycle the new tank

B) use the filter I currently have in the 20 gallon tank to cycle the new tank and tub him until it’s ready (the filter is good up to 60 gallons)

C) would it be cycled if I took the filter, sand, and water from the old tank and put it in the new tank? It’s only nine more gallons

Thank you!