Draw 3 isomers of the thiocyanate ion SCN (with a 1- charge), label formal charges for each isomer.
a. [SCN]⁻, [SCN]⁻, [SCN]⁻
b. [SCN]⁻, [SCN]⁻, [SCN]⁻
c. [SCN]⁻, [SCN]⁻, [SCN]⁻
d. [SCN]⁻, [SCN]⁻, [SCN]⁻