Gst on security service outward supply

I want to know that if a proprietor security Service firm issued a service bill for Feb-2019 The GST payment will be paid by service receiver then what is the nature of supply to be select by service provider while filling GSTR 3B monthly return. 

(a) Outward taxable supplies (other than zero rated, nil rated and exempted) 

(b) Outward taxable supplies (zero rated )

(c) Other outward supplies (Nil rated, exempted) 

(d) Inward supplies (liable to reverse charge)

(e) Non-GST outward supplies.

Please suggest.