What is the standard cell potential of a cell made of theoretical metals ma/ma2+ and mb/mb2+ if the reduction potentials are -0.19 v and -0.85, respectively?

a) +0.66 V
b) -0.66 V
c) +1.04 V
d) -1.04 V

it's filtration, but this is an assumption so my apologies if i got this

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.

the answer is symmetrical : )