Command Units caught in Area Fire

[AJ at the Bank]

Don't have the rules to hand....but can you please advise -

When a Command Unit gets caught in Artillery or Aircraft firing zones....does it take hits rolled against AT or AP? Possibly AT as Commands have an intrinsic Save?

Many thanks

[Big Insect]

I am away at present, so will need to check for certain, upon my return, but as you state AP seems logical.
Its a bit abstract with Command units as they can be represented on table as AFV or soft targets, but actually represent the Command network on the battkefield, but AP seems sensible.
Cheers
Mark