Queries on dependent visa application

Hi All,

Iam on a tier 2 general visa in the UK and now applying for my wife's dependent visa. At the start of the application process, there is an option to choose the following:

reason for visit
visa type
visa sub type

Can anyone help me out with what I should be choosing here? It the reason for visit 'settlement' and type 'wife' or is it something else?

Appreciate your support.

Thanks,
Ankur