d) None of the above. A taser is a tool, somewhere between fists and a gun in the lethality scale, which might be appropriate in some but not all cases.
Personally, I wouldn't be interested. I've got an aversion to them because of 30 years of human rights work under my belt and know too many cases of tasers (and cattle prods) being used in horrific ways. :/ The earlier models of Taser were pain control devices instead of incapacitation devices; they used lower voltages than today's units and had a completely different effect.
I'll shoot someone if I must, as an absolute last resort, to save my life or someone else's life. I won't torture.