That's not very nice, is it? vs. is that? (Tag Question)

[Penny Lane]

What is the correct 'tag question' for
'That's not very nice'

'is it?'
or
'is that?'

stay happy everybody,
cheers.

[Alan]

Hi,

My simple answer: 'is it?'

Alan
_________________
English as a Second Language
You can read my ESL story Present Simple

[Penny Lane]

Thanks Alan,
That's what I thought, and that was what I always used, but just got to wonder if that was correct.
Cheers!