Hi, just a couple quick questions for the more experienced bikers out there

My road bike has SRAM 9-speed gripshifters (twist). Do the SRAm road front and rear derailleurs (i.e, SRAM Red, Force, Rival, etc) work with these shifters? Or do I need to stick w/ MTB derailleurs? I haven't been able to find a definitive answer for this.

I have a 9-speed cassette (SRAM 11/28) matched w/a 50/34 170mm crank. Should be using a 9-speed chain w/ this pairing or a 10-speed chain?

Thanks for all your help