Which is the best option to do: digital marketing, certified ethical hacking, big data? Which one will boost my resume the most?

Digital marketing could be a good option. You will get lots of opportunities in that field. You can work from home also.

See, there is a great scope of digital marketing but not many students opt for the certified ethical hacking course so there are very less certified ethical hackers in India due to which many companies hire foreign hackers, so take the decision very carefully what you want to do.