Gst registration

Dear All,

If proprietor (Individual) is having 3 business A B & C if A turnover is 10 lac, B turnover is 15 lac and C turnover is 7 Lac does he need to take GST registration or not all business turnover is below 20Lac for the year but if we merge all 3 business it will more the 20lac.

Condition : -

1. If all 3 business are in different service in different location in one state?

2. If all 3 business is having same service but different location in one state?