Thumbs up [Q] Rooting I9500 on stock/official 4.3 [MJ9]

I am currently on 4.3 ( MJ9 ) Stock Rom, on I9500 model. Updated the phone early without researching on knox and warranty flag. ( now the downloading mode shows warrnty bit : 0 option but no knox word. )

Now i want to root my I9500 what can i do so i can do it safely. ?
Please Guide.