Train Raheny to Donabate - Leap card?

[odyssey06]

I need to get from Raheny to Donabate by train. I have a Leap card.

I need to get DART from Raheny to Howth Junction or Malahide, then switch to a commuter train to Donabate.

I'm a bit confused about ticketing \ use of Leap card on commuter services.
Donabate isn't listed in the short hop zone.

Do I:
(a) Buy a physical ticket in Raheny that covers the entire journey
(b) Tag on at Raheny and tag off at Donabate
(c) Tag on at Raheny and tag off at junction and buy a ticket there
(d) Tag on at Raheny, off at the junction DART platform THEN tag on on the commuter platform

Thanks.

 

[Peanuts20]

Just tag at Raheny and off at Donabate, if you do the journey within 90 mins it should only cost you €2