What Internship to choose if I want to end up in McKinsey,Bain etc?

Hi all!

So I feel like I'm not fully ready to apply for McKinsey, Bain, BCG yet and I want to wait until next year.

What do you think is the best internship I could do this year(I'm in my penultimate year) that will best equip me and they would like it on my CV the most and why?

a) Fund management
b) Investment Banking
c) Tech firm
d) Consulting (Big4)

I know that they all have pros and cons but I want to hear general opinions. It would be really useful for me.
Thank you so much guys!

Much appreciate