With my rating, I suppose I'm not really qualified to give advice on becoming a grandmaster, but I'd suppose you have to combine both options you listed there and even add some more. I also don't think there's any prescribed way to develop your way of thinking to match that of a grandmaster.
How to think like a grand master
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Ask a grandmaster how he thinks.
Dec 22, 2013
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#4
To get to that level of thinking you need to have every aspect of the game covered.
Openning and endgame study: Study lots of grandmaster games and openning and endgame books.
Huge tactical vision: Practice hard puzzles without moving the pieces on the board.
Great positional understanding: Study lots of grandmaster games, and group the study in themes or topics.
Be born with the ability.
I pretend to think like a grandmaster a lot 
The fundamentals are:
1.Positional assessment: these are the building blocks of the position that will be the foundation for your plan. Do you know that knights are better with mutual isolated d-pawns and bishops are better in an open or mobile centers all else being equal? Is their bishop both pointing at your kingside and defending weak squares in their own camp? Then trading that piece off is what will motivate your analysis.
That's the other thing, analysis, the nitty gritty detail oriented work at the board. We aren't computers, we can't aimlessly calculate and decide the best move based on the position 20 moves from now, so we need a plan. When I was new to chess and was defending against some random guy on the Internet many years ago in a 10 minute game I was like, "oh crap, he has a plan, if I avoid exchanges I'll be squeezed and if I exchange I'll be in a hopeless endgame, I'm done" as I knew the weaknesses in my position and was well aware he knew mine, I didnt' win that one. Back then I would "wing it" and calculate aimlessly just thinking about the center and activity mainly.
When a 1300 smashes you effortlessly it really brings home the point that you have plenty to learn so I took the books more seriously.
How to think like a grand master ?
option A -By practicing more tactics
option B -By Observing lots and lots of Games and developing the ability of positional chess
or any other options,kindly guide me if you know...suggestions are most welcomed